Polar bear standing up

Hello team Mojang,

I was playing around with the new snapshot.
I found a glitch:
When you fight a polarbear he will do a jump attack, when he is standing on his 2 back leggs you quickly type /gamemode 1 and it will stay in that motion.

It is very funny to see it walking like a human but I think it should be fixed in further snapshots.

(PS my English isn't that well because I am dutch)

Thank you for your time,

Quinten Rijken