I also could have sworn this used to happen for observations missing IDs, but either that was a bug or I was just mistaken (and that error message only appeared for observations missing IDs and media evidence like a photo). See https://forum.inaturalist.org/t/uploading-observations-without-ids-says-incorrect-error-message/2372/7
I updated your topic title to reflect an actionable feature request. Welcome to the forum!