Now in the pre-release, you can actually swim by holding Ctrl and W. But once I let go of the Ctrl key, My character is still swimming posture, but not moving. Only when I press Space I return to upright posture. This results in some very ridiculous things, such as swimming on land and frozen posture.
Environment
Windows 10, Java Edition, 16GB RAM, Surface Book
Linked issues
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Comments 2
Duplicate of MC-128257, which, good for you, is marked as fixed for the next snapshot.
I don't see how this is a bug, since it works pretty much the same way sprinting works, with the only difference being that you don't stop when swimming into a block. I also cannot confirm the part where you come out of water in the swimming position since that was already fixed.