Aseprite Thumbnails Stopped Working

While this should work, it doesn’t for me. I can’t Aseprite as the default app for .aseprite files, not any way I tried it (double clicking and going from there, doing it via settings).

I have reported my issue back in September of 2023 too, but have yet to receive any response. But as I think these issues might be linked (thumbnails and opening by clicking the file both need the default app to be set) I thought I’d react to this post about it too.

My post in question: