Unexpected data loss

I think I also suffered from the second case you’re describing Disabling Flatpak's ephemeral file system > There is a behavior in Flatpak that hurts UX. Apps that don’t use file portals seem to be given a “virtual” file system to write files to. The app is getting a success code on file writes, even though the success only happened on that “virtual” file system and there is no change on the user’s machines. The content of that “virtual” file system are lost on app restart. Is there a way to disable this behavior so that the app gets an error code instead of a success code when trying to write file…