Clicking this does nothing.

Actually while typing this it crashed. Here is the crash report: https://pastebin.com/5dN8CWWN

I tried on several, none of them had died in the mean time.

The visit button won't work on entities that die afterwards. I can try to add in info on the last known position if that's desirable. As for the crash, I'll look into it.

Huh. Can you send me the world file, and is this on Academy?

This is in University 1.16, which currently isn't public.

Just tested it again and it totally worked. I am very confused now.