From f53ab295e2db64881160cee8279a896b07d230dd Mon Sep 17 00:00:00 2001
From: Edoardo Cavazza <edoardo.cavazza@chialab.it>
Date: Thu, 2 Oct 2025 10:53:19 +0200
Subject: [PATCH 1/3] Collect all child nodes of lists and tables

---
 src/core/struct_tree.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/core/struct_tree.js b/src/core/struct_tree.js
index f8eafbc17b481..e31b06a17e6fe 100644
--- a/src/core/struct_tree.js
+++ b/src/core/struct_tree.js
@@ -754,6 +754,23 @@ class StructTreePage {
 
     const element = new StructElementNode(this, dict);
     map.set(dict, element);
+    switch (element.role) {
+      case "L":
+      case "LBody":
+      case "LI":
+      case "Table":
+      case "THead":
+      case "TBody":
+      case "TFoot":
+      case "TR": {
+        // Always collect all child nodes of lists and tables, even empty ones
+        for (const kid of element.kids) {
+          if (kid.type === StructElementType.ELEMENT) {
+            this.addNode(kid.dict, map, level - 1);
+          }
+        }
+      }
+    }
 
     const parent = dict.get("P");
 

From 38cc9ae38cbae7a227265f49eba962f1ee999f04 Mon Sep 17 00:00:00 2001
From: Edoardo Cavazza <edoardo.cavazza@chialab.it>
Date: Mon, 6 Oct 2025 09:57:02 +0200
Subject: [PATCH 2/3] Add test case for empty cells

---
 test/pdfs/.gitignore     |   1 +
 test/pdfs/issue20324.pdf | Bin 0 -> 11151 bytes
 test/test_manifest.json  |   8 +++++++-
 test/unit/api_spec.js    |  35 +++++++++++++++++++++++++++++++++++
 4 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 test/pdfs/issue20324.pdf

diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 6b1ede9aefd21..0a79b24a4c4cd 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -620,6 +620,7 @@
 !autoprint.pdf
 !bug1811694.pdf
 !bug1811510.pdf
+!issue20324.pdf
 !bug1815476.pdf
 !issue16021.pdf
 !bug1770750.pdf
diff --git a/test/pdfs/issue20324.pdf b/test/pdfs/issue20324.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..c5f2a1d4ffc8d94defd614bbfce93627b0287046
GIT binary patch
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zZp1v)as8fFr?@(Z^%j>YI1{1}39JxFcg(6h$ObBI^sX~&;M@bqhmb*04IFU;FW^Ft
z%5|UrQnpdi!kFT*`^*{@l*M|t(P<PQ8T9IgQ@r&W<G*dF1p3PUzikS!^wG)x%H`k4
dMc(VICO8-9_<wXL6Ko>gr!T>IfR6K*{{yBH5()qS

literal 0
HcmV?d00001

diff --git a/test/test_manifest.json b/test/test_manifest.json
index 6a810a98ceaee..7c350b69b9ea8 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -1676,6 +1676,12 @@
     "lastPage": 1,
     "type": "eq"
   },
+    {  "id": "issue20324",
+       "file": "pdfs/issue20324.pdf",
+       "md5": "13250232aa91444f983279581d9c02d6",
+       "rounds": 1,
+       "type": "eq"
+    },
   {
     "id": "issue13561_reduced",
     "file": "pdfs/issue13561_reduced.pdf",
@@ -13026,6 +13032,6 @@
     "file": "pdfs/issue20232.pdf",
     "md5": "cc53e96a8fd9eafbfbb74de564f37047",
     "rounds": 1,
-    "type": "eq"
+    "type": "other"
   }
 ]
diff --git a/test/unit/api_spec.js b/test/unit/api_spec.js
index 648fe309e7952..2ef29bec46878 100644
--- a/test/unit/api_spec.js
+++ b/test/unit/api_spec.js
@@ -5043,6 +5043,41 @@ Caron Broadcasting, Inc., an Ohio corporation (“Lessee”).`)
       canvasFactory.destroy(canvasAndCtx);
       await loadingTask.destroy();
     });
+
+    it("should collect all list and table items in StructTree", async function() {
+      const findNodes = (node, check) => {
+        const results = [];
+        if (check(node)) {
+          results.push(node);
+        }
+        if (node.children) {
+          for (const child of node.children) {
+            results.push(...findNodes(child, check));
+          }
+        }
+        return results;
+      };
+      const loadingTask = getDocument(buildGetDocumentParams("issue20324.pdf"));
+
+      const pdfDoc = await loadingTask.promise;
+      const page = await pdfDoc.getPage(1);
+      const tree = await page.getStructTree({
+        includeMarkedContent: true,
+      });
+      const cells = findNodes(
+        tree,
+        node => node.role === "TD"
+      );
+      expect(cells.length).toEqual(4);
+
+      const listItems = findNodes(
+        tree,
+        node => node.role === "LI"
+      );
+      expect(listItems.length).toEqual(4);
+
+      await loadingTask.destroy();
+    });
   });
 
   describe("Multiple `getDocument` instances", function () {

From 2146cb26f11939ddabf6f9fc648d8d9cd3001a30 Mon Sep 17 00:00:00 2001
From: Edoardo Cavazza <edoardo.cavazza@chialab.it>
Date: Mon, 20 Oct 2025 09:47:21 +0200
Subject: [PATCH 3/3] Move tables test to specific struct tree spec file

---
 test/test_manifest.json       |  8 +-------
 test/unit/api_spec.js         | 35 -----------------------------------
 test/unit/struct_tree_spec.js | 29 +++++++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 42 deletions(-)

diff --git a/test/test_manifest.json b/test/test_manifest.json
index 7c350b69b9ea8..6a810a98ceaee 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -1676,12 +1676,6 @@
     "lastPage": 1,
     "type": "eq"
   },
-    {  "id": "issue20324",
-       "file": "pdfs/issue20324.pdf",
-       "md5": "13250232aa91444f983279581d9c02d6",
-       "rounds": 1,
-       "type": "eq"
-    },
   {
     "id": "issue13561_reduced",
     "file": "pdfs/issue13561_reduced.pdf",
@@ -13032,6 +13026,6 @@
     "file": "pdfs/issue20232.pdf",
     "md5": "cc53e96a8fd9eafbfbb74de564f37047",
     "rounds": 1,
-    "type": "other"
+    "type": "eq"
   }
 ]
diff --git a/test/unit/api_spec.js b/test/unit/api_spec.js
index 2ef29bec46878..648fe309e7952 100644
--- a/test/unit/api_spec.js
+++ b/test/unit/api_spec.js
@@ -5043,41 +5043,6 @@ Caron Broadcasting, Inc., an Ohio corporation (“Lessee”).`)
       canvasFactory.destroy(canvasAndCtx);
       await loadingTask.destroy();
     });
-
-    it("should collect all list and table items in StructTree", async function() {
-      const findNodes = (node, check) => {
-        const results = [];
-        if (check(node)) {
-          results.push(node);
-        }
-        if (node.children) {
-          for (const child of node.children) {
-            results.push(...findNodes(child, check));
-          }
-        }
-        return results;
-      };
-      const loadingTask = getDocument(buildGetDocumentParams("issue20324.pdf"));
-
-      const pdfDoc = await loadingTask.promise;
-      const page = await pdfDoc.getPage(1);
-      const tree = await page.getStructTree({
-        includeMarkedContent: true,
-      });
-      const cells = findNodes(
-        tree,
-        node => node.role === "TD"
-      );
-      expect(cells.length).toEqual(4);
-
-      const listItems = findNodes(
-        tree,
-        node => node.role === "LI"
-      );
-      expect(listItems.length).toEqual(4);
-
-      await loadingTask.destroy();
-    });
   });
 
   describe("Multiple `getDocument` instances", function () {
diff --git a/test/unit/struct_tree_spec.js b/test/unit/struct_tree_spec.js
index 0551565597c79..8c9c1c2343bab 100644
--- a/test/unit/struct_tree_spec.js
+++ b/test/unit/struct_tree_spec.js
@@ -151,4 +151,33 @@ describe("struct tree", function () {
     );
     await loadingTask.destroy();
   });
+
+  it("should collect all list and table items in StructTree", async function () {
+    const findNodes = (node, check) => {
+      const results = [];
+      if (check(node)) {
+        results.push(node);
+      }
+      if (node.children) {
+        for (const child of node.children) {
+          results.push(...findNodes(child, check));
+        }
+      }
+      return results;
+    };
+    const loadingTask = getDocument(buildGetDocumentParams("issue20324.pdf"));
+
+    const pdfDoc = await loadingTask.promise;
+    const page = await pdfDoc.getPage(1);
+    const tree = await page.getStructTree({
+      includeMarkedContent: true,
+    });
+    const cells = findNodes(tree, node => node.role === "TD");
+    expect(cells.length).toEqual(4);
+
+    const listItems = findNodes(tree, node => node.role === "LI");
+    expect(listItems.length).toEqual(4);
+
+    await loadingTask.destroy();
+  });
 });