Please, check this update issue.
Do you have some kind of sporadic network issues? There’s a good amount of lines in the log file stating that there is some issue with name resolution.
The last two errors in the screen shot are saying the same - during the time the flatpak should have been downloaded there was no network connection able to serve the request.
Yes, we do have sporadic network issues. The ISP is switching cables (DSL) to fiber optics, the change has not yet reached our neighborhood, the service has been unstable.
Thank you once more for your attention!