Player_Model is swinging like it is on a hinge. I am using a fresh installation of 1.12.2-forge1.12.2-14.23.5.2847 and no other mods.

It's haunted!

It'll go away tomorrow (or you can disable it in your config, "enableEasterEggs")

Well its not broken so thats a good thing. I seriously thought it was a bug.