GIMP 3.2.x not recognizing rawtherapee plugin

[GarzaW]

It looks like the issue is definitely with the AppImage architecture. As the admin pointed out, AppImages are somewhat sandboxed, so GIMP probably just can't see your system-wide RawTherapee installation even though the plugin itself is trying to initialize. Since the official GIMP AppImage is built on Debian Bookworm, it often runs into these kinds of compatibility snags with external binaries on other distros like your Xubuntu 24.04 setup.