Try to execute the AppImage via CLI, to check stdout and stderr.
I did it for both LO25 still and fresh appimage downloaded today. from ubuntu 20.04 command line on pro updates. I see a splash screen for a fraction of a second. .1 second or less, just enough to say something flashed... (which also showed 1 out of 5 click to starts), then return to the prompt. no errors.
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