I have setup a page CT with an automatic path alias: [node:menu-link:parent:url:path] (based on the D9 standard install profile + pathauto)
I create 1 page "Test", put it into the main menu as the only page, and it receives the automatic alias: "/test".
I then navigate to the main menu and manually add an anchor link to this page. (/admin/structure/menu/manage/main/add)
Menu link title: Test anchor link
Link: /node/1#anchor
Hit "Save".
Move this anchor link to a child of the main "Test" page.
Create another anchor link:
Menu link title: Test anchor link 2
Link: /node/1#anchor2
Hit "Save".
This eventually errors out on a mysql lock error (on the menu_link_content table) and the anchor link was not added.
If I disable the "menu_trail_by_path" module it works fine.
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