List of steps to reproduce (step by step, including full links if applicable):

• https://commons.wikimedia.beta.wmflabs.org/w/index.php?title=User_talk:AJ-test&offset=&limit=500&action=history but obviously you don't see it.

What happens?:
The edit from 16:17, 14 April 2022‎ and all edits after that are marked as "updated since your last visit" ("updatedmarker" class), but this is impossible as I viewed the page many times since then to make edits. Some of those were not done with my script (there's an "undo" for example) so I must have viewed the page as the undo completed.

What should have happened instead?:
Only edits that are actually new since my last visit should be marked as such.