This was an official Flatpak from Tor Browser, so there’s no reason why it should be less reliable than the packages from distribution maintainers. Not to mention for atomic distros, flatpaks are the official way to install software.

You can check the Tor Project blog to figure out the latest release, and go to your Tor Browser’s menu > Help > About Tor Browser to see if it matches. It should be version 14.0.7. If it is not, the fix is detailed in the Github issue I linked in the post

This seems like something that Flatpak should be able to handle though. Afaik Mullvad Browser never had this issue. Flatpaks also have numerous advantages, like automatically handling desktop shortcuts.