diff --git a/cli/.gitignore b/cli/.gitignore
index 74d3e102f59ba..e6c9bd265535a 100644
--- a/cli/.gitignore
+++ b/cli/.gitignore
@@ -1,3 +1,4 @@
 npm/
 gen/
-node_modules/
\ No newline at end of file
+node_modules/
+windmill-utils-internal/.npmrc
\ No newline at end of file
diff --git a/cli/windmill-utils-internal/package-lock.json b/cli/windmill-utils-internal/package-lock.json
index db260b02dc22f..ddf3437925324 100644
--- a/cli/windmill-utils-internal/package-lock.json
+++ b/cli/windmill-utils-internal/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "windmill-utils-internal",
-  "version": "1.3.0",
+  "version": "1.3.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "windmill-utils-internal",
-      "version": "1.3.0",
+      "version": "1.3.2",
       "license": "Apache 2.0",
       "devDependencies": {
         "@types/node": "^24.2.0",
diff --git a/cli/windmill-utils-internal/package.json b/cli/windmill-utils-internal/package.json
index ff4418f79bac1..20f20a4c9a235 100644
--- a/cli/windmill-utils-internal/package.json
+++ b/cli/windmill-utils-internal/package.json
@@ -1,6 +1,6 @@
 {
   "name": "windmill-utils-internal",
-  "version": "1.3.1",
+  "version": "1.3.2",
   "description": "Internal utility functions for Windmill",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -21,4 +21,4 @@
   "files": [
     "dist/**/*"
   ]
-}
\ No newline at end of file
+}
diff --git a/cli/windmill-utils-internal/src/parse/parse-schema.ts b/cli/windmill-utils-internal/src/parse/parse-schema.ts
index 9cd4a596b45bb..bb2e2078af7a1 100644
--- a/cli/windmill-utils-internal/src/parse/parse-schema.ts
+++ b/cli/windmill-utils-internal/src/parse/parse-schema.ts
@@ -1,7 +1,10 @@
 /**
  * Type alias for enum values - can be an array of strings or undefined
  */
-export type EnumType = string[] | { label: string; value: string }[] | undefined;
+export type EnumType =
+  | string[]
+  | { label: string; value: string }[]
+  | undefined;
 
 /**
  * Represents a property in a JSON schema with various validation and display options
@@ -40,6 +43,16 @@ export interface SchemaProperty {
   originalType?: string;
 }
 
+const ITEMS_PRESERVED_FIELDS = [
+  "properties",
+  "required",
+  "additionalProperties",
+  "enum",
+  "resourceType",
+  "contentEncoding",
+  "description",
+] as (keyof SchemaProperty["items"])[];
+
 /**
  * Converts argument signature types to JSON schema properties.
  * This function handles various Windmill-specific types and converts them
@@ -54,22 +67,22 @@ export function argSigToJsonSchemaType(
     | string
     | { resource: string | null }
     | {
-      list:
-      | (string | { name?: string; props?: { key: string; typ: any }[] })
-      | { str: any }
-      | { object: { name?: string; props?: { key: string; typ: any }[] } }
-      | null;
-    }
+        list:
+          | (string | { name?: string; props?: { key: string; typ: any }[] })
+          | { str: any }
+          | { object: { name?: string; props?: { key: string; typ: any }[] } }
+          | null;
+      }
     | { dynselect: string }
     | { dynmultiselect: string }
     | { str: string[] | null }
     | { object: { name?: string; props?: { key: string; typ: any }[] } }
     | {
-      oneof: {
-        label: string;
-        properties: { key: string; typ: any }[];
-      }[];
-    },
+        oneof: {
+          label: string;
+          properties: { key: string; typ: any }[];
+        }[];
+      },
   oldS: SchemaProperty
 ): void {
   const newS: SchemaProperty = { type: "" };
@@ -206,15 +219,34 @@ export function argSigToJsonSchemaType(
         }
         newS.items = { type: "object", properties: properties };
       } else {
-        newS.items = { type: "object" };
+        // Preserve ALL user-defined fields when parser cannot infer structure
+        newS.items = { type: oldS.items?.type || "object" };
+
+        if (oldS.items && typeof oldS.items === "object") {
+          ITEMS_PRESERVED_FIELDS.forEach((field) => {
+            if (oldS.items && oldS.items[field] !== undefined) {
+              newS.items![field] = oldS.items[field];
+            }
+          });
+        }
       }
       newS.originalType = "record[]";
     } else {
-      newS.items = { type: "object" };
+      // Preserve ALL user-defined fields for untyped lists (same as record[] branch)
+      newS.items = { type: oldS.items?.type || "object" };
+
+      if (oldS.items && typeof oldS.items === "object") {
+        ITEMS_PRESERVED_FIELDS.forEach((field) => {
+          if (oldS.items && oldS.items[field] !== undefined) {
+            newS.items![field] = oldS.items[field];
+          }
+        });
+      }
       newS.originalType = "object[]";
     }
   } else {
-    newS.type = "object";
+    // Preserve existing type when inference fails, default to "object" for undefined/null
+    newS.type = oldS.type ?? "object";
   }
 
   const preservedFields = [
diff --git a/cli/windmill-utils-internal/tsconfig.json b/cli/windmill-utils-internal/tsconfig.json
index 38f18728f4474..35814c1f7a2e8 100644
--- a/cli/windmill-utils-internal/tsconfig.json
+++ b/cli/windmill-utils-internal/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "ES2022",
-    "module": "commonjs",
+    "module": "ES2022",
     "lib": ["ES2022"],
     "declaration": true,
     "outDir": "./dist",
@@ -11,7 +11,7 @@
     "noUnusedParameters": false,
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "baseUrl": "./",
     "esModuleInterop": true,
     "experimentalDecorators": true,
@@ -19,11 +19,6 @@
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
   },
-  "include": [
-    "src/**/*"
-  ],
-  "exclude": [
-    "node_modules",
-    "dist"
-  ]
-}
\ No newline at end of file
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index bb77f1b2a681c..3b56a7fc1a218 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -86,7 +86,7 @@
 				"windmill-parser-wasm-ts": "1.593.0",
 				"windmill-parser-wasm-yaml": "1.593.0",
 				"windmill-sql-datatype-parser-wasm": "1.512.0",
-				"windmill-utils-internal": "^1.3.1",
+				"windmill-utils-internal": "^1.3.2",
 				"xterm": "^5.3.0",
 				"xterm-readline": "^1.1.2",
 				"y-monaco": "^0.1.4",
@@ -15893,9 +15893,9 @@
 			"integrity": "sha512-uHNL8F72/Tf96xF3hOHnPDjkEyqXw7fNjcPJiUhth9sTQkcwUIoJMOdwm8/cs+j9kKVRJ4tgNYMHEBLylazp6g=="
 		},
 		"node_modules/windmill-utils-internal": {
-			"version": "1.3.1",
-			"resolved": "https://registry.npmjs.org/windmill-utils-internal/-/windmill-utils-internal-1.3.1.tgz",
-			"integrity": "sha512-afRGUDcvaUfGu7FA6DD0xWECQiKnXADs0N4WyQQ+OvaloxZ4oQzdEpLnVab/m3T02hhs29ru4Ilrdxu3ozyT5Q==",
+			"version": "1.3.2",
+			"resolved": "https://registry.npmjs.org/windmill-utils-internal/-/windmill-utils-internal-1.3.2.tgz",
+			"integrity": "sha512-sLE7sfmN3vBwPReqKorBrusnn83Qnm8vVFqh/7+kz8mf98ojMVDMgBginjlh9KBtVfWu9NhyjGS+WXRcnWalzA==",
 			"license": "Apache 2.0"
 		},
 		"node_modules/word-wrap": {
diff --git a/frontend/package.json b/frontend/package.json
index ece9c3ada4970..593a348b8e3ba 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -158,7 +158,7 @@
 		"windmill-parser-wasm-ts": "1.593.0",
 		"windmill-parser-wasm-yaml": "1.593.0",
 		"windmill-sql-datatype-parser-wasm": "1.512.0",
-		"windmill-utils-internal": "^1.3.1",
+		"windmill-utils-internal": "^1.3.2",
 		"xterm": "^5.3.0",
 		"xterm-readline": "^1.1.2",
 		"y-monaco": "^0.1.4",