diff --git a/workspaces/arborist/lib/arborist/build-ideal-tree.js b/workspaces/arborist/lib/arborist/build-ideal-tree.js
index 1edd0b643b60d..c0f31008d6496 100644
--- a/workspaces/arborist/lib/arborist/build-ideal-tree.js
+++ b/workspaces/arborist/lib/arborist/build-ideal-tree.js
@@ -1306,6 +1306,12 @@ This is a one-time fix-up, please be patient...
       .sort(({ name: a }, { name: b }) => localeCompare(a, b))
 
     for (const edge of peerEdges) {
+      // node.parent gets mutated during loop execution due to recursive #nodeFromEdge calls.
+      // When a compatible peer is found (e.g. a@1.1.0 replaces a@1.2.0), the original node loses its parent.
+      // if node is detached/removed from the tree, or has no parent, so no need to check remaining edgesOut for that node.
+      if (!node.parent) {
+        break
+      }
       // already placed this one, and we're happy with it.
       if (edge.valid && edge.to) {
         continue
diff --git a/workspaces/arborist/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs b/workspaces/arborist/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs
index 855539521b9df..f76c505e89ff2 100644
--- a/workspaces/arborist/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs
+++ b/workspaces/arborist/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs
@@ -74672,6 +74672,315 @@ exports[`test/arborist/build-ideal-tree.js TAP more peer dep conflicts metadeps
 Array []
 `
 
+exports[`test/arborist/build-ideal-tree.js TAP more peer dep conflicts peerDep replacement of top level dep with different version resulting detached top level dep > default result 1`] = `
+ArboristNode {
+  "children": Map {
+    "@test/a" => ArboristNode {
+      "dev": true,
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "@test/a",
+          "spec": "^1.1.0",
+          "type": "dev",
+        },
+        EdgeIn {
+          "from": "node_modules/@test/b",
+          "name": "@test/a",
+          "spec": "1.1.0",
+          "type": "peer",
+        },
+      },
+      "edgesOut": Map {
+        "@test/b" => EdgeOut {
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "to": "node_modules/@test/b",
+          "type": "peerOptional",
+        },
+        "@test/c" => EdgeOut {
+          "name": "@test/c",
+          "spec": "1.1.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+        "lodash" => EdgeOut {
+          "name": "lodash",
+          "spec": "^4.17.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+        "uniq" => EdgeOut {
+          "name": "uniq",
+          "spec": "^1.0.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+      },
+      "location": "node_modules/@test/a",
+      "name": "@test/a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep/node_modules/@test/a",
+      "resolved": "http://localhost:4873/@test/a/-/a-1.1.0.tgz",
+      "version": "1.1.0",
+    },
+    "@test/b" => ArboristNode {
+      "dev": true,
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "type": "dev",
+        },
+        EdgeIn {
+          "from": "node_modules/@test/a",
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "type": "peerOptional",
+        },
+      },
+      "edgesOut": Map {
+        "@test/a" => EdgeOut {
+          "name": "@test/a",
+          "spec": "1.1.0",
+          "to": "node_modules/@test/a",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@test/b",
+      "name": "@test/b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep/node_modules/@test/b",
+      "resolved": "http://localhost:4873/@test/b/-/b-1.1.0.tgz",
+      "version": "1.1.0",
+    },
+  },
+  "edgesOut": Map {
+    "@test/a" => EdgeOut {
+      "name": "@test/a",
+      "spec": "^1.1.0",
+      "to": "node_modules/@test/a",
+      "type": "dev",
+    },
+    "@test/b" => EdgeOut {
+      "name": "@test/b",
+      "spec": "1.1.0",
+      "to": "node_modules/@test/b",
+      "type": "dev",
+    },
+  },
+  "isProjectRoot": true,
+  "location": "",
+  "name": "tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep",
+  "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep",
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP more peer dep conflicts peerDep replacement of top level dep with different version resulting detached top level dep > force result 1`] = `
+ArboristNode {
+  "children": Map {
+    "@test/a" => ArboristNode {
+      "dev": true,
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "@test/a",
+          "spec": "^1.1.0",
+          "type": "dev",
+        },
+        EdgeIn {
+          "from": "node_modules/@test/b",
+          "name": "@test/a",
+          "spec": "1.1.0",
+          "type": "peer",
+        },
+      },
+      "edgesOut": Map {
+        "@test/b" => EdgeOut {
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "to": "node_modules/@test/b",
+          "type": "peerOptional",
+        },
+        "@test/c" => EdgeOut {
+          "name": "@test/c",
+          "spec": "1.1.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+        "lodash" => EdgeOut {
+          "name": "lodash",
+          "spec": "^4.17.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+        "uniq" => EdgeOut {
+          "name": "uniq",
+          "spec": "^1.0.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+      },
+      "location": "node_modules/@test/a",
+      "name": "@test/a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep/node_modules/@test/a",
+      "resolved": "http://localhost:4873/@test/a/-/a-1.1.0.tgz",
+      "version": "1.1.0",
+    },
+    "@test/b" => ArboristNode {
+      "dev": true,
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "type": "dev",
+        },
+        EdgeIn {
+          "from": "node_modules/@test/a",
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "type": "peerOptional",
+        },
+      },
+      "edgesOut": Map {
+        "@test/a" => EdgeOut {
+          "name": "@test/a",
+          "spec": "1.1.0",
+          "to": "node_modules/@test/a",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@test/b",
+      "name": "@test/b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep/node_modules/@test/b",
+      "resolved": "http://localhost:4873/@test/b/-/b-1.1.0.tgz",
+      "version": "1.1.0",
+    },
+  },
+  "edgesOut": Map {
+    "@test/a" => EdgeOut {
+      "name": "@test/a",
+      "spec": "^1.1.0",
+      "to": "node_modules/@test/a",
+      "type": "dev",
+    },
+    "@test/b" => EdgeOut {
+      "name": "@test/b",
+      "spec": "1.1.0",
+      "to": "node_modules/@test/b",
+      "type": "dev",
+    },
+  },
+  "isProjectRoot": true,
+  "location": "",
+  "name": "tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep",
+  "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep",
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP more peer dep conflicts peerDep replacement of top level dep with different version resulting detached top level dep > strict result 1`] = `
+ArboristNode {
+  "children": Map {
+    "@test/a" => ArboristNode {
+      "dev": true,
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "@test/a",
+          "spec": "^1.1.0",
+          "type": "dev",
+        },
+        EdgeIn {
+          "from": "node_modules/@test/b",
+          "name": "@test/a",
+          "spec": "1.1.0",
+          "type": "peer",
+        },
+      },
+      "edgesOut": Map {
+        "@test/b" => EdgeOut {
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "to": "node_modules/@test/b",
+          "type": "peerOptional",
+        },
+        "@test/c" => EdgeOut {
+          "name": "@test/c",
+          "spec": "1.1.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+        "lodash" => EdgeOut {
+          "name": "lodash",
+          "spec": "^4.17.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+        "uniq" => EdgeOut {
+          "name": "uniq",
+          "spec": "^1.0.0",
+          "to": null,
+          "type": "peerOptional",
+        },
+      },
+      "location": "node_modules/@test/a",
+      "name": "@test/a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep/node_modules/@test/a",
+      "resolved": "http://localhost:4873/@test/a/-/a-1.1.0.tgz",
+      "version": "1.1.0",
+    },
+    "@test/b" => ArboristNode {
+      "dev": true,
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "type": "dev",
+        },
+        EdgeIn {
+          "from": "node_modules/@test/a",
+          "name": "@test/b",
+          "spec": "1.1.0",
+          "type": "peerOptional",
+        },
+      },
+      "edgesOut": Map {
+        "@test/a" => EdgeOut {
+          "name": "@test/a",
+          "spec": "1.1.0",
+          "to": "node_modules/@test/a",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@test/b",
+      "name": "@test/b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep/node_modules/@test/b",
+      "resolved": "http://localhost:4873/@test/b/-/b-1.1.0.tgz",
+      "version": "1.1.0",
+    },
+  },
+  "edgesOut": Map {
+    "@test/a" => EdgeOut {
+      "name": "@test/a",
+      "spec": "^1.1.0",
+      "to": "node_modules/@test/a",
+      "type": "dev",
+    },
+    "@test/b" => EdgeOut {
+      "name": "@test/b",
+      "spec": "1.1.0",
+      "to": "node_modules/@test/b",
+      "type": "dev",
+    },
+  },
+  "isProjectRoot": true,
+  "location": "",
+  "name": "tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep",
+  "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-more-peer-dep-conflicts-peerDep-replacement-of-top-level-dep-with-different-version-resulting-detached-top-level-dep",
+}
+`
+
 exports[`test/arborist/build-ideal-tree.js TAP more peer dep conflicts prod dep directly on conflicted peer, full peer set, newer > force result 1`] = `
 ArboristNode {
   "children": Map {
diff --git a/workspaces/arborist/test/arborist/build-ideal-tree.js b/workspaces/arborist/test/arborist/build-ideal-tree.js
index 32bc6b25ed39c..24961be79ac32 100644
--- a/workspaces/arborist/test/arborist/build-ideal-tree.js
+++ b/workspaces/arborist/test/arborist/build-ideal-tree.js
@@ -1655,6 +1655,16 @@ t.test('more peer dep conflicts', async t => {
       error: false,
       resolvable: true,
     },
+    'peerDep replacement of top level dep with different version resulting detached top level dep': {
+      pkg: {
+        description: 'a@ -> (PeerOptional(b, c, dep, dep))  b -> ( Peer(a) ) c -> ( Peer(a) )',
+        devDependencies: {
+          '@test/a': '^1.1.0',
+          '@test/b': '1.1.0',
+        },
+      },
+      error: false,
+      resolvable: true },
   })
 
   createRegistry(t, true)
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/a.json b/workspaces/arborist/test/fixtures/registry-mocks/content/test/a.json
new file mode 100644
index 0000000000000..94cd8577573fb
--- /dev/null
+++ b/workspaces/arborist/test/fixtures/registry-mocks/content/test/a.json
@@ -0,0 +1,146 @@
+{
+  "name": "@test/a",
+  "versions": {
+    "1.2.0": {
+      "name": "@test/a",
+      "version": "1.2.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "lodash": "^4.17.21",
+        "underscore": "^1.13.1",
+        "@test/b": "1.2.0",
+        "@test/c": "1.2.0"
+      },
+      "peerDependenciesMeta": {
+        "@test/b": {
+          "optional": true
+        },
+        "@test/c": {
+          "optional": true
+        },
+        "lodash": {
+          "optional": true
+        },
+        "underscore": {
+          "optional": true
+        }
+      },
+      "_id": "@test/a@1.2.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-k7WYu8tdQY1aq8QV+7YEGcoSYXrdCACqnabuvNC8Tpwvpk/MF25CeX4nei6eliVaHqHxzNzAr60ne2TgsEoz2Q==",
+        "shasum": "b609076c847a018b144ab68c953817847195535a",
+        "tarball": "http://localhost:4873/@test/a/-/a-1.2.0.tgz"
+      },
+      "contributors": []
+    },
+    "1.1.0": {
+      "name": "@test/a",
+      "version": "1.1.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "lodash": "^4.17.0",
+        "uniq": "^1.0.0",
+        "@test/b": "1.1.0",
+        "@test/c": "1.1.0"
+      },
+      "peerDependenciesMeta": {
+        "@test/b": {
+          "optional": true
+        },
+        "@test/c": {
+          "optional": true
+        },
+        "lodash": {
+          "optional": true
+        },
+        "uniq": {
+          "optional": true
+        }
+      },
+      "_id": "@test/a@1.1.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-qlfAcmAKeohHKBVVAnwsiDs+URz5jCPYlXe+srdxX6Nzhl9W6FX9kV5Lm6XahBhB+H/c+eRi+ghAE8YcdzmFIA==",
+        "shasum": "0d9b53f67e05d388195ad096f61fe2c1c6f0ff8d",
+        "tarball": "http://localhost:4873/@test/a/-/a-1.1.0.tgz"
+      },
+      "contributors": []
+    },
+    "1.0.0": {
+      "name": "@test/a",
+      "version": "1.0.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "lodash": "^4.17.0",
+        "uniq": "^1.0.0",
+        "@test/b": "1.0.0",
+        "@test/c": "1.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@test/b": {
+          "optional": true
+        },
+        "@test/c": {
+          "optional": true
+        },
+        "lodash": {
+          "optional": true
+        },
+        "uniq": {
+          "optional": true
+        }
+      },
+      "_id": "@test/a@1.0.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-BRD01XQTy4WW2PrMdV0ZvHdqlY6v0FY3kyvEIv4v0n7apOHQwuQqjdL4iWnApfEwD0o0mVSbQs5s6DibNmDnMg==",
+        "shasum": "a1ec39760cf04261fff44b23582f1bafba0b14ff",
+        "tarball": "http://localhost:4873/@test/a/-/a-1.0.0.tgz"
+      },
+      "contributors": []
+    }
+  },
+  "time": {
+    "modified": "2025-07-31T16:24:31.780Z",
+    "created": "2025-07-29T12:59:32.758Z",
+    "1.2.0": "2025-07-29T13:15:20.477Z",
+    "1.1.0": "2025-07-31T16:24:09.634Z",
+    "1.0.0": "2025-07-31T16:24:31.780Z"
+  },
+  "users": {},
+  "dist-tags": {
+    "latest": "1.0.0"
+  },
+  "_rev": "44-1c1667b80cb416cc",
+  "_id": "@test/a",
+  "readme": "ERROR: No README data found!",
+  "_attachments": {}
+}
\ No newline at end of file
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/a/a-1.0.0.tgz b/workspaces/arborist/test/fixtures/registry-mocks/content/test/a/a-1.0.0.tgz
new file mode 100644
index 0000000000000..00df7811e9df7
Binary files /dev/null and b/workspaces/arborist/test/fixtures/registry-mocks/content/test/a/a-1.0.0.tgz differ
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/a/a-1.1.0.tgz b/workspaces/arborist/test/fixtures/registry-mocks/content/test/a/a-1.1.0.tgz
new file mode 100644
index 0000000000000..c1a2ba7b9b186
Binary files /dev/null and b/workspaces/arborist/test/fixtures/registry-mocks/content/test/a/a-1.1.0.tgz differ
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/b.json b/workspaces/arborist/test/fixtures/registry-mocks/content/test/b.json
new file mode 100644
index 0000000000000..b32a350389ca7
--- /dev/null
+++ b/workspaces/arborist/test/fixtures/registry-mocks/content/test/b.json
@@ -0,0 +1,95 @@
+{
+  "name": "@test/b",
+  "versions": {
+    "1.0.0": {
+      "name": "@test/b",
+      "version": "1.0.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "@test/a": "1.0.0"
+      },
+      "_id": "@test/b@1.0.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-q2p6qVG/lIpauYmngTeuWBAhqMYOR/dAzIk/nhpIuuqueji1cuhXFkuxykRn1N/imlLKWEzXxdS72krNMAohYg==",
+        "shasum": "049ecb3edfce0c78d1e94718bda1e2c24d004f5c",
+        "tarball": "http://localhost:4873/@test/b/-/b-1.0.0.tgz"
+      },
+      "contributors": []
+    },
+    "1.1.0": {
+      "name": "@test/b",
+      "version": "1.1.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "@test/a": "1.1.0"
+      },
+      "_id": "@test/b@1.1.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-WrPD0/5vcNlm12B6XDjTiIBN0U5SfGAuPBYJi3QeV2jEaBAnXnjWnffv7Dov0KPON3zsPg11t/EB4BDVgWIJEg==",
+        "shasum": "33107fbfdc56efed9ae21749aae5ea84bc4a5b80",
+        "tarball": "http://localhost:4873/@test/b/-/b-1.1.0.tgz"
+      },
+      "contributors": []
+    },
+    "1.2.0": {
+      "name": "@test/b",
+      "version": "1.2.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "@test/a": "1.2.0"
+      },
+      "_id": "@test/b@1.2.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-X90tU1P+EZ/IyiG4ICrQgKEBcQBQugZ/0OKo9xGN8a2dWPoJ7zefIQwpoQTy2NE5w7SgGyi6v9PQSw191v524Q==",
+        "shasum": "b735bde9da04cbd5f1cbb31817bf64302f0db265",
+        "tarball": "http://localhost:4873/@test/b/-/b-1.2.0.tgz"
+      },
+      "contributors": []
+    }
+  },
+  "time": {
+    "modified": "2025-07-29T13:02:09.586Z",
+    "created": "2025-07-29T13:01:53.128Z",
+    "1.0.0": "2025-07-29T13:01:53.128Z",
+    "1.1.0": "2025-07-29T13:02:01.228Z",
+    "1.2.0": "2025-07-29T13:02:09.586Z"
+  },
+  "users": {},
+  "dist-tags": {
+    "latest": "1.2.0"
+  },
+  "_rev": "9-e8970996bfeb2c4f",
+  "_id": "@test/b",
+  "readme": "ERROR: No README data found!",
+  "_attachments": {}
+}
\ No newline at end of file
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/b/b-1.0.0.tgz b/workspaces/arborist/test/fixtures/registry-mocks/content/test/b/b-1.0.0.tgz
new file mode 100644
index 0000000000000..0a10edf65b2e3
Binary files /dev/null and b/workspaces/arborist/test/fixtures/registry-mocks/content/test/b/b-1.0.0.tgz differ
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/b/b-1.1.0.tgz b/workspaces/arborist/test/fixtures/registry-mocks/content/test/b/b-1.1.0.tgz
new file mode 100644
index 0000000000000..96f29aea98300
Binary files /dev/null and b/workspaces/arborist/test/fixtures/registry-mocks/content/test/b/b-1.1.0.tgz differ
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/c.json b/workspaces/arborist/test/fixtures/registry-mocks/content/test/c.json
new file mode 100644
index 0000000000000..e26765f61e416
--- /dev/null
+++ b/workspaces/arborist/test/fixtures/registry-mocks/content/test/c.json
@@ -0,0 +1,95 @@
+{
+  "name": "@test/c",
+  "versions": {
+    "1.0.0": {
+      "name": "@test/c",
+      "version": "1.0.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "@test/a": "1.0.0"
+      },
+      "_id": "@test/c@1.0.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-ikGDvMXxzqHgCkIycVNWmpfDs6G/aA7i3AY1Or+T+hO+2G/t+rfIxnLgIc4p10K7GM2ZxcipK9Z7U6LAtTO0iw==",
+        "shasum": "96b5a6fa92f8713c240686e9f3dfd5c00df7497e",
+        "tarball": "http://localhost:4873/@test/c/-/c-1.0.0.tgz"
+      },
+      "contributors": []
+    },
+    "1.1.0": {
+      "name": "@test/c",
+      "version": "1.1.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "@test/a": "1.1.0"
+      },
+      "_id": "@test/c@1.1.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-BNxNmwGwAhVxA8RQpog/wy/NNZfa5ruskwZePlKfu1zpLVtsrjO8zGau6C/c8iIw9mwrVqBAeBuFpUwJhLTAZA==",
+        "shasum": "01db72391f551fd7944adbf0f54eaebc389b90c4",
+        "tarball": "http://localhost:4873/@test/c/-/c-1.1.0.tgz"
+      },
+      "contributors": []
+    },
+    "1.2.0": {
+      "name": "@test/c",
+      "version": "1.2.0",
+      "description": "",
+      "main": "index.js",
+      "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+      },
+      "keywords": [],
+      "author": "",
+      "license": "ISC",
+      "type": "commonjs",
+      "peerDependencies": {
+        "@test/a": "1.2.0"
+      },
+      "_id": "@test/c@1.2.0",
+      "_nodeVersion": "22.14.0",
+      "_npmVersion": "11.4.2",
+      "dist": {
+        "integrity": "sha512-pAHdEr8mb8mXuWPQL0mbkyHVulhzVWQ3HvpO9OBZ0azF56p9cr1+hVy/CajxPdEr/Crx6iBfjpoaNYscVPbvMg==",
+        "shasum": "e915f26882f8bbde7e238c02908bbc5625cf3c4e",
+        "tarball": "http://localhost:4873/@test/c/-/c-1.2.0.tgz"
+      },
+      "contributors": []
+    }
+  },
+  "time": {
+    "modified": "2025-07-29T13:03:42.407Z",
+    "created": "2025-07-29T13:03:29.009Z",
+    "1.0.0": "2025-07-29T13:03:29.009Z",
+    "1.1.0": "2025-07-29T13:03:36.559Z",
+    "1.2.0": "2025-07-29T13:03:42.407Z"
+  },
+  "users": {},
+  "dist-tags": {
+    "latest": "1.2.0"
+  },
+  "_rev": "9-19d0ff85a20ff576",
+  "_id": "@test/c",
+  "readme": "ERROR: No README data found!",
+  "_attachments": {}
+}
\ No newline at end of file
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/c/c-1.0.0.tgz b/workspaces/arborist/test/fixtures/registry-mocks/content/test/c/c-1.0.0.tgz
new file mode 100644
index 0000000000000..65661f1328219
Binary files /dev/null and b/workspaces/arborist/test/fixtures/registry-mocks/content/test/c/c-1.0.0.tgz differ
diff --git a/workspaces/arborist/test/fixtures/registry-mocks/content/test/c/c-1.1.0.tgz b/workspaces/arborist/test/fixtures/registry-mocks/content/test/c/c-1.1.0.tgz
new file mode 100644
index 0000000000000..cdbee76034001
Binary files /dev/null and b/workspaces/arborist/test/fixtures/registry-mocks/content/test/c/c-1.1.0.tgz differ