The biggest tell is at 0:21.
You see the badge flying around as a physics object and then, when the animation stops the left side part of the necklace "resets" and slides up on the bots neck despite that being like a ball suddenly deciding to go from a rest to rolling up hill.
It looks like it went from being rendered as a physics object to slowing down enough that it returned to being a regular object attached to the model's rigging .