I met this strange thing in my game,So I disabled all my mods and created a new sandbox mode game.
I was not able to have exact conditions to have this replicated, but was getting this error on every 2nd or 3rd try.
as you can see salt water is dripping to form an infinite salt water tile damaging nearby tiles. I was trying to change liquids, dropping height, remove reservoirs, still happens at random for me.
Drip liquid to 3X1 or 4x1 tile deep pool, Put liquid vent on 5th tile, 7th tiles from the botttom, wait till the pressure start damaging nearby tiles.
There are 2 saves with reproduced issue for different liquids.