Would suggest trying these, in case you are still stuck forwards/backwards as they're general things that could potentially fix this issue as well as when being stuck in general:
A. Go to File Explorer > Saved Games > Pokemon Rejuvenation > Game.exe
- Game.exe should be your most recent safe file which is stuck (unless you have more than save file, in that case it might be something else e.g. Game_2.rxdata)
- Rename it to whatever you want or delete this file (as it's the one with the character sprite being stuck) TIP: in the event you delete the wrong folder, you can recover it via Recycling Bin (or the Mac equivalent)
- Rename the last save file before that one, it's usually highest number e.g. "Game - 2772 - Loui - 206h 42m - 14 badges" to "Game.exe" as it will become your new save file.
- This obviously will break the time and space barrier to set your game back to when you last saved previously, hopefully curing you of forward/back curse.
B. Likely not the solution but perhaps try this before (A.):
- Change the game version to the latest version (V12 as of typing this). Changing to latest version usually helps with this sort of thing.
Hopefully these help! Good luck!