"This entry already existed in the past, so it can only be re-created by a Trusted Contributor or higher."
It did NOT exist in the past. A re-run entry was deleted at my request a few days ago as seen in the edit log, but I'm not trying to re-add that one, so why do I get that message, doesn't really make sense.
It's needlessly in the way, so can something be done about it? A bug in the deletion of an entry? Something to do with "(not set)" perhaps, my edits don't show up like that in the edit log.
So because Season 2019 Episode 3 was deleted, only a TC or higher can add an episode to that season with that number. The system doesn't know the difference between what was deleted and what you're trying to add.
Of course not accessible to everyone. Just when a deletion is done for a wrong listing, having an admin tick a marker to free it up for an overwrite by regulars, instead of blocking us creating and replacing it with the correct ep. I guess it's done to prevent abuse but isn't that the job of too many edits for your level.