I assume you were relying on the itch.io app for this update? What were the old and new versions? Did the update work for you before, but only broke with this particular release?
Tiled 1.2.1 (64-bit flatpack) update to latest. Yes update working other programs ass well.
Hmm, I don't maintain the Flatpak release. I think the right place for reporting issues with it is here. And maybe you should try the snap, which I recently updated.