Magiea sets QT_PLUGIN_PATH by default. Usually as 'QT_PLUGIN_PATH=/usr/lib64/qt5/plugins:/usr/lib64/qt5/plugins/kcms:'
If you are using an AppImage with QT, you need to unset this, or set it to the location of the AppImage.
One example is Chiaki - the Client for PlayStation 4 Remote Play for Linux (and other OS's) - https://github.com/thestr4ng3r/chiaki
So if you download Chiaki to /home//Downloads, in order to run it you need to do:
Or you can make a quick bash script in /usr/local/bin
Then simply chmod +x /usr/local/bin/psremote, and chown /usr/local/bin/psremote
Then you can just launch it with 'psremote' from anywhere.