Is this exclusive to the current animation editor? Or are you seeing this also happen if you tried to change priority in the beta animation editor or manually via script?
I’m experiencing the same issue when it comes to the animation editor. I can also say Roblox Studio is crashing whenever you go to change and save your Game Settings as well. I believe this bug occurs in other scenarios within Roblox Studio and is not exclusive to these two situations.
Note: I’ve already tried reinstalling Roblox Studio onto my device and I still experience this issue.