Core animations playing incorrectly in studio

For a few days now since the most recent studio update, there has been issues in our game pertaining to core animations playing incorrectly. This bug only seems to occur in studio and it works fine in game.
Behavior in studio:

Behavior in game:

Place where the bug occurs: (2) Testing Place TBU - Roblox
The bug began to occur on the 22nd of March and has not been fixed since.
The bug still occurs without any plug-ins enabled.

Repro: Will send a place file to any Roblox staff that investigates.


Forgot to mention that I believe that this bug has incredibly high impact if it effects all non-normal rigs. Unsure if it does.