I think I have a fix for you, but Friday is a busy day for me, just off to see friends for a beer. Have a look back tomorrow and I will post something.
Edit: Back again.
I do not 100% think it is an appimage renaming export problem, however since you are using Mint 22.3 try this cut down appimage.
https://www.gimp-forum.net/Thread-Gimp-3...-22-3-only
This it working here: https://sendvid.com/uxs9eids
Edit: Back again.
I do not 100% think it is an appimage renaming export problem, however since you are using Mint 22.3 try this cut down appimage.
https://www.gimp-forum.net/Thread-Gimp-3...-22-3-only
This it working here: https://sendvid.com/uxs9eids