I’m on official 1521. Almost everywhere is unwalkable floor. Not just bases, but bare ground with nothing on it. I can’t place a thrall anywhere. It gives me the prompt “must be placed on walkable floor”. My following thralls aren’t walking to me, they are teleporting to the next closest spot of walkable floor. NPCs are stuck in place because they have no walkable floors around them. They draw their weapons and want to attack, but all they can do give me an evil stare. Same for my thralls. I order them to attack, but they can’t walk to the enemy. I was preparing for a purge, but I wasn’t able to position thralls anywhere. I just tried to trigger a purge in multiple places. I even put a coffer on just foundations in the middle of flat empty desert, but “There is no reachable location for the purge to setup camp”. They can’t build anywhere because of unwalkable floors. No walkable floors means there’s no path to anything.
Update: a server restart seems to have fixed things and now everything is back to being walkable