Another case of can't add "as" attribute on a released production

I was trying to edit the cast of an episode of Happy! (http://www.imdb.com/title/tt7509504) and got this error message, despite the episode having been released on Wednesday.


I assume the problem is that it is still marked as being in post-product.



Okay, now I'm a little surprised to find that I can edit the production status. I've never done that before. I've changed it to released but it didn't ask for a date (which seems a little odd). So, maybe this isn't a problem.