oinkydoodle
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Bug still affects latest version (v1.18.31)
I'm on Windows 10 Edition, here are my observations:
It happens whenever I press sneak while transitioning from sprinting to swimming. I can get it to happen starting from sprinting while standing in the water, or from sprint jumping into the water.
I can produce it 100% consistently with the following:
Steps to Reproduce:
1. Sprint on land toward water that is at least two blocks deep
2. Jump / fall into the water while sprinting
3. Press and release the sneak/crouch key just after you enter the water
For as long as you hold any movement direction, you are now stuck "crouching" while swimming. You can look straight up to rise very slowly, otherwise looking less than 85% of the way up will cause you to fall. You can hold jump to completely prevent vertical motion, regardless of where you are looking. Pressing sneak/crouch has no effect. You can exit this state by letting go of all movement directions or inputting null movement (W and S at the same time, or A+D)
I also had high success producing this bug if I:
Steps to Reproduce:
1. Start from the surface of water that is at least two blocks deep
2. Sprint forward on the surface of the water so that you remain in a "standing" position
3. Spam crouch many times to bring yourself into the water and you'll end up pressing and releasing crouch during the swim transition
Another unique behavior I found was if you break the block you are "standing" on while in this crouch-swim, your movement will freeze completely. This only happens if you are holding jump, otherwise you will continue sinking very quickly and moving in other ways normally. In this frozen state, letting go of space will return you to crouch-swim state
Steps to Reproduce:
1. Enter crouch-swim as above
2. Sink to the bottom such that you are "standing" on a block. (This works best if there is a block with an exposed edge, since you need to be holding a movement direction, and the sneak-swim will not let you fall of that edge)
3. Hold jump
4. Break the block
5. You are now frozen in place underwater while holding jump and some movement direction.