Not sure if I would call this a bug, but I think maybe +Rooms mod on maps isn't working as it should. Not sure if it was like this before this recent update or something new that was introduced.
I was under the impression that "Rooms" were areas in a maze that were 2X2 or larger based on the patch notes of 1.23.1 ("Rooms" are now randomly generated within the catacombs (open spaces)).
Or is a "Room" just an area on the maze that can be accessed from 2 different locations?
Using this map
Mystical patched valley map
Use Item to Receive Effect
+2 Evil Presences
+1 Rooms
Quantity: 1
I don't see any open areas, but maybe the "Room" is the line that I drew?
Probably not something to put on the top of the list, just thought I'd let you know and ask for some clarification.