When the player is hurt the damage tilt to the left is supposed to tilt towards the direction where the player takes damage. This is an extremely helpful way to find out which mob or player attacked you and from where.
Also this has been a bug since Minecraft allowed you to connect to a client server.
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That's annoying. I was really hoping they would see this years later and understand that quite a few people would like this feature to be fixed.
Duplicate of MC-26678, which has unfortunately been resolved as Won’t Fix.