Deleting post marks thread as unread

[Noordfrees]

Recently, a new post was deleted from the Europeans thread. Afterwards, the thread was marked as Has Unread Posts for me in the list of topics. Viewing the now-last post on the topic (which was made by me!) fixed this.
Now, a new post on this topic was deleted again, and again the now-last post (by me) was marked unread to me.
This is weird and unexpected because a) if I posted something I have evidently read it and b) the same post has been marked as read for me before so it should not become unread again.

[gunchleoc]

This bug has been around forever. I expect the problem is that the thread info gets updated when the post is made but not "un-updated" when the post is deleted.