Steps to reproduce
Enter swimming animation while in 2-block deep water or greater.
Die while swimming (in all my cases I've drowned)
Respawn w/o exiting to menu.
Attempt to collide with blocks above you (i.e. jump into a block from below, run into a block that's 1-block above the ground from the side), and find you're able to clip through it.
Temporary solutions
You can either exit and reload the world, or enter a body of water and start then end the swimming animation to fix the hitbox.
I am unsure if this affects multiplayer since this has only happened to me in single-player thus far.
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We're tracking this issue in MCPE-109925, so this ticket is being resolved and linked as a duplicate.
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