Whenever my friends or I upgrade Altars to Tier 3 for some reason it seems to be a 50/50 on whether or not the altar vanishes once upgraded. It has done this for both Set and Derketo altars, we have not tested it or experienced the issue with any other altars.
In order for us to reproduce the bug we
1.Place altar in what seems to be bugged location because if it doesn’t work there once it never will again
2. Upgrade the altar to tier 3
3.Watch altar vanish
I don’t know of a more detailed way to word this bug other than this, perhaps others could add their input please, i’m new here.