Pond Water visual bug

Apologies old post but got it again once on a pure modless.

It is apparently caused by having a pond and a room around it doing Auto-floors. - room can just be fence made, it still auto-floors the section of pond. remove floor, pond hole is empty. try to put water back in that visual happens.

If you use mods/cc,try moving the whole mods folder to another place, delete the localthumbcache.package and then test to see if the issue remains without mods/cc there.