This bug has been here since 1.3 has been released

Back in Minecraft 1.2.5, when you took damage, your camera angle would tilt in the direction of the damage.

This helped you figure out where the damage was coming from quickly (it's also a cool looking effect).

1.3 broke it. it can be fixed easily the code is still there
https://youtu.be/QtKTuZRIKXs
https://www.youtube.com/watch?v=pAJPc71YOnY