@fuzzbawlz: I noticed something similar one time where I...

fuzzbawlz
2026-04-25T23:37:35-04:00

I noticed something similar one time where I used the edit mode in the mode menu to edit a post at the same time someone else was editing it, and that accidentally made me undo their edit since I hadn't refreshed the page thus the list of tags on the post it displayed to me didn't yet include the ones they had just added (I hope I'm wording that comprehensibly). So my best guess is the AI tags page works similarly, when you first open the page it loads the tags on all the posts displayed, and when you click to add one tag you're technically resubmitting all the tags on the post. Thus if someone added tags in the meantime, to the site it looks like you're removing their tags since clicking add doesn't first check if the tags have been updated before it performs your update. Which is weird because I've never seen the same problem with the tag script in the mode menu.