When Pitivi starts the render window appears out of the gui and can't be reattached. So the application Pitivi is unusable on Debian/Gnome. It looks like "viewer: Fix a race where gtksink is started before being embedded in the UI" https://gitlab.gnome.org/GNOME/pitivi/-/merge_requests/485 I have to install the Flatpak version of Pitivi to be able to use it on my Debian PC.
This bug still exists in version 2023.03-3 of ptivi on Testing.
Made a merge request here: https://salsa.debian.org/gnome-team/pitivi/-/merge_requests/7 -- Danial Behzadi
2023.03-4