I noticed that if you try to change the points of your first animation, (Number #0) Sometimes Gdevelop won’t let you deselect the Share same point for all spites of this animation Well it does, but then it turns back to default again.
It’s a UX issue not really a bug.
If all the points of an animation are the same in all frames the UI activate back the toggle.
You have to change it for the frame you are currently editing (after unactivating it) for it to stick unactivated.