In my underwater base, I have a boat elevator to get up to the surface of the sea. When I enter the boat I get sent off into the water tube and as soon as I hit the water I get thrown off the boat, which however, ascends slowly as intended. Also, if I just let the boat go up itself, everything works fine.
Duplicate of MC-16413, please use the search function to see if your bug has already been submitted. Currently over 56% of tickets are being closed as duplicate.