In versions before 24w44a, you could swim when in crouching mode under a slab.
Now, you are no longer able to swim when in this state. This is most likely caused by the fix of MC-152728.
h3. Steps to reproduce
Go into water with a slab above you so that you are crouched
Try to swim by sprinting
❌ You can not swim
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Clones MC-148933?
Relates to/caused by the fix of MC-152728. Previously sprinting while crouching/sneaking was possible, it no longer is due to that fix, breaking this behavior.
Adding a special case for sprinting in water when crouched should resolve this while keeping the fix applied.