Steps to replicate the issue

• visit https://test.wikipedia.org/
• log into an admin account (has autopatrol)
• create a random page
  • should display the check mark in the right PageTriage toolbar to mark as unreviewed, but does not
• delete the page using More -> Delete
• undelete the page using Special:Undelete (this is a trick to unreview your own article)
  • should display the check mark in the right PageTriage toolbar to mark as reviewed, but does not

An important use case for this is if you have autopatrolled and NPP perms, but are feeling iffy about an article you created and you want to unreview it so that you get another set of eyes on it.

Another use case is easier testing of PageTriage software patches. Software testers are often admins on testwiki who create their own test articles.