When you swim up into the moon pool all water physics disappear for me. I fall to the bottom then I have to build a base to get the water physics back up.
I did a bit more testing with this, it is 100% possible to cause this when you dock the Seamoth into the Moonpool. Even if you reload the game, you will cause this issue to occur if you dock the Seamoth again. It begins when you try to float your character for air.
The only workaround I've found is that you should stick to the ladders to avoid breaking the swimming mechanics. Jumping from the walkways into the water does not create this issue, so you are free to do so
Same thing happened to me. I crafted 4 foundations hoping to put moonpool on it. Didn't work so I removed the foundations and placed a moonpool. Upon swimming to top of moonpool it changed the physics. I SANK TO THE BOTTOM OF SEA, AND THE SOUND WAS AS IF I WAS WALKING IN MY BASE.
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The only workaround I've found is that you should stick to the ladders to avoid breaking the swimming mechanics. Jumping from the walkways into the water does not create this issue, so you are free to do so
Video proof of the bug in action