Steps to reproduce:
Make sure "Hide Paper Doll" is disabled;
Spawn a parrot and tame it;
Make it go on your shoulder;
Sneak.
Expected results:
The parrot goes down with your shoulder as you sneak, and stay quiet there.
Observed results:
The parrot stays floating and freaks out, moving its head to all directions.
It looks normal in third person view, it's only bugged in the paper doll.
Thank you for your report!
We're actually already tracking this issue at MCPE-40012, so we will resolve and link this ticket as a duplicate.
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