Camera centers on the pan if you crouch... It's pretty wierd because you appears higher than your other friend (Snapshots on server, still same on vanilla minecraft...)

That's why everyone looks down when people looks at crouching peoples xD
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How to reproduce:
Join a server/normal world
Crouch...
Press f5 twice and look forward, you see that plus is on your pan instead of center of your head?
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It affects all version from 1.8.3 and above as far as I know (and probary the future 1.10.3 if unresolved)...