Extra bones mess up with humanoid animations

Yeah bud - research avatar masking. This will allow you to keep humanoid rig but mask the bones that are not humanoid. I've only used this in a test environment - not full on production - however it worked when I finally got the setup correct. Although I did not have an animated 'extra' bone.

I'm having this same exact problem and it's incredibly frustrating. Have you found a solution @gtaharaedmonds?

Everyone has mentioned the solution of: Animation Tab> Mask> Transform and clicking the boxes of all the additional bones. I've done that, but it still doesn't work. My dude's gun is still weirdly offset. It's so close to correct, but it's off. Like in your example- everything looks perfect with a Generic rig, but I need the Humanoid features for I$$anonymous$$ and other things.

I don't understand how it's so hard to find solutions on what seems to me like a fundamental feature you would need to make a game.