From entrez, pushing a boulder into the water on Plane of Water resulted in a sanity check warning about a boulder at water location (every turn until bubble movement eventually pushed it back out of the water). Make boulders in that situation always fail to plug the water and vanish rather not attempt to plug and remain intact. This also changes the chance to plugging water from 90% to 50% when dealing with a wall of water somewhere other than Plane of Water.
124 KiB
124 KiB