I have a world in 1.14.4 in which all entitys are not affected by water physics, e.g. squids die in water, players can't swim but are able to run underwater (at full speed like on land)/water does not affect movement speed at all, Player die if the fall in water from a high position/get damaged even from smaller heights (happens also to all entitys). Other worlds are NOT affected be this, just this one world. I do not use any mods or add-ons. Placing new water still has no physics. Restarting the game didn't help.