Strange behavior when selecting and rotating bones

  1. What do you want to achieve?
    Report this strange behavior, and find a solution.

  2. What is the issue?

  1. What solutions have you tried so far?
    I searched some threads about this, I tried switching between humanoid and animationController, I tried selecting either the bone sphere or the bone cone.

PS. I was going to report this behavior in some old mesh deformer threads where the roblox team asks us to report issues but the threads were all closed.