When you are viewing panda in water from certain angles, it's legs are not rendered underwater.
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Fixed in 1.15-pre1

I'm unable to reproduce this in the affected version, so I cannot confirm if this is fixed or not in 1.15 pre-1. Someone who clearly could reproduce this bug before please tell if this is fixed or not.
it is excessivley hard to reproduce... it randomly happens and is hard to control. i never managed to take a screenshot

@unknown, is this now fixed for you in 1.15-pe1?
Probably is. I tried to reproduce it and I didn't manage to do it.

Okay, marking as fixed. Let us know if you see this happening again.
it's the same one as MC-165874
the panda comes into rendering inside of water, the underwater parts get invisible, it comes into screen center.
you were fortunate enough to take a screenshot, unlike me