You should still have the original file as recovery before applying the plugin.
Also, did you select properly the main layer you wanted to add a joystick to?
And did you have a non-null length animation (more than 0f)?
I had 5 individual points (N,R,L,T,D) set up across various layers (all my character’s features are in different layer groups) from keyframes 0-4 all within a joystick_head folder but I will clarify; I didn’t lose anything on this thank you, I made a backup before running the plugin just in case!