To Replicate:
Duplicate an animation workspace
Add a new animation row
Observe
this causes the whole workspace to become bugged out, it doesn’t let you set animations in the newly greyed out rows completely breaking the workspace.
In the example provided you can see by adding the FireLast row to this workspace it has caused IKOffset and Idle to no longer have animations, in these rows I can no longer add any animations, in the UI it appears like I am reading them but when I load the workspace again they are once again unset. This completely breaks the workspace and deleting the newly added row does not fix it.