ah ok this is it… but still a bit weird. I am starting anki with /usr/local/bin/anki --no-sandbox as Anki on Fedora 35 (just into beta) in a container is having an issue with webview (I posted another question on that: Fedora 35 and Anki 2.1.47 updates with blank Anki window
So i guess that --no-sandbox is doing its thing but Anki is also taking that as another file? Anyway I can live with that.