Deleting a withdrawn ID marks the observation as unreviewed even though an additional ID was already made

I can confirm this happens -

-I added an ID of human, then added another ID of human (which withdraws the first ID). I refreshed the page to ensure that the checkbox for “Mark as Reviewed” in the lower right corner was checked.
-I deleted my first, withdrawn ID of human
-The observation is now not marked as reviewed, even though I have an active ID on the observation

I edited the title of your bug report to reflect this unexpected behavior.

You could also try using the URL parameter ident_user_id in the meantime:

and see also this open feature request for better identification searching tools: