Season 12 of Big Bang Theory won't play via Library in Apple TV
I have purchased Season 12 of Big Bang Theory but it won't play using the Library at the top level of Apple TV+. It offers me the chance, instead, to buy the episodes even though it knows that I've bought the season because it tells me that I've bought it.
Instead, I have to use the Computers app to play the season.
Why is this? What can I do to fix it? Restarting hasn't helped. The episodes are right there in my TV library along with all the other seasons.
Any help would be appreciated.
Apple TV 4K, tvOS 13