There are three Doctor Who series:
Doctor Who 1963-1986 listed in thetvdb as Doctor Who
Doctor Who 2005-2022 listed in thetvdb as Doctor Who (2005)
Doctor Who 2023
The new series already has some specials and season 1 starts in May. This is listed by the BBC as Doctor Who (2023). It is also listed on the BBC programme pages, within the BBC iPlayer and BBC Doctor Who Twitter page as Doctor Who (2023). Both imdb and tmdb are referring to it as Doctor Who (2023).
The tvdb however has this as Season 14 of the 2005 series.
I did raise a ticket with them about this and was told that the new episodes coming in May will not be 2023 season 1 but 2005 season 14. They said that the BBC was calling it a new season and a return. I have replied to them with more evidence but don’t hold out much hope.
Doing an internet search I found comments by other people saying that had had no luck with thetvdb. One person had created a record for Doctor Who (2023) but it was deleted.
I’m sure this will all cause lots of chaos come May and trying to cope with this situation in Plex will be a nightmare.