I'm on Arch Linux (KDE Plasma 6.5.4m KDE-Framework-Version 6.20.0, QT-Version 6.10.0, Kernel-Version 6.17.9-arch-1 (64bit), Graphic X11).
I've downloaded your last image ( pulp_1.3.5_amd64.AppImage ) and started it with App-ImageLauncher.
When I try to open up the dialog "ADD DIRECTORY", I get a quite transparent window.
After waiting a few seconds, the application crashers