--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_2634.py	Mon Sep 15 11:37:51 2025 +0200
@@ -0,0 +1,65 @@
+import pymupdf
+
+import difflib
+import json
+import os
+import pprint
+
+
+def test_2634():
+    if not hasattr(pymupdf, 'mupdf'):
+        print('test_2634(): Not running on classic.')
+        return
+    path = os.path.abspath(f'{__file__}/../../tests/resources/test_2634.pdf')
+    with pymupdf.open(path) as pdf, pymupdf.open() as new:
+        new.insert_pdf(pdf)
+        new.set_toc(pdf.get_toc(simple=False))
+        toc_pdf = pdf.get_toc(simple=False)
+        toc_new = new.get_toc(simple=False)
+
+        def clear_xref(toc):
+            '''
+            Clear toc items that naturally differ.
+            '''
+            for item in toc:
+                d = item[3]
+                if 'collapse' in d:
+                    d['collapse'] = 'dummy'
+                if 'xref' in d:
+                    d['xref'] = 'dummy'
+
+        clear_xref(toc_pdf)
+        clear_xref(toc_new)
+
+        print('toc_pdf')
+        for item in toc_pdf: print(item)
+        print()
+        print('toc_new')
+        for item in toc_new: print(item)
+
+        toc_text_pdf = pprint.pformat(toc_pdf, indent=4).split('\n')
+        toc_text_new = pprint.pformat(toc_new, indent=4).split('\n')
+
+        diff = difflib.unified_diff(
+                toc_text_pdf,
+                toc_text_new,
+                lineterm='',
+                )
+        print('\n'.join(diff))
+
+        # Check 'to' points are identical apart from rounding errors.
+        #
+        assert len(toc_new) == len(toc_pdf)
+        for a, b in zip(toc_pdf, toc_new):
+            a_dict = a[3]
+            b_dict = b[3]
+            if 'to' in a_dict:
+                assert 'to' in b_dict
+                a_to = a_dict['to']
+                b_to = b_dict['to']
+                assert isinstance(a_to, pymupdf.Point)
+                assert isinstance(b_to, pymupdf.Point)
+                if a_to != b_to:
+                    print(f'Points not identical: {a_to=} {b_to=}.')
+                assert abs(a_to.x - b_to.x) < 0.01
+                assert abs(a_to.y - b_to.y) < 0.01