Not sure this is a bug, maybe something just changed in the way monoliths are handled? In any case, I just found one that had no activation stone. Nothing. Literally just a slab of ominous rock with a few knowledge stones around it. Dug the foundations out completely just to make sure it wasn’t burried somewhere.
Kinda felt like standing at a portal back in the days. “Well, this looks important! Uhhhh… what do I do?”
Anybody else encountered this? Has anybody found monoliths outside of story quests that have their activation stones?