unknown object type serialized by server

Every map im going in just crashes the game and this message pops up please help

Encountering same issue with a Lake.
Encountered on 3rd time, and unable to zone back into that same lake without encountering the error



Edit: Followed up by a disconnect and instance crash when interacting with a Mirror thing in a map

I've just had this start to happen as well, when trying to enter a map. After launching again I couldn't access my hideout, the game would give error "Buffer Underflow" on the loading screen and then close. Eventually I got back into my hideout (old one timed out so I lost all portals), but now the game just closes when I try to enter new maps.

Had been playing fine for an hour or so prior.

I had this same error when progressing through Act 7 causing the game to crash.

After logging back in, the game crashes when using any waypoint outside town, when going to hideout it causes a "Buffer Underflow' error.