This may be unrelated, but I'm hoping that it's evidence of engineering effort being applied to the iTunes movie ecosystem ...
I updated my iPhone 7 Plus and my iPad Pro 12.9 2017 to iOS 13.3 and iPadOS 13.3 yesterday. Playing with the TV app on those platforms, the behavior of the library display is dramatically improved. Before, a great many movie tiles took forever to update and even after one page was fully updated you could scroll away and once again be looking at empty image tiles for minutes, though the movie names would draw.
In 13.3, there was a long pause the first time I looked at my movie library, while (presumably) some kind of preloading was going on. Then every tile drew. Scrolling slowly downward shows a continuous stream of fully drawn tiles and a fast flip displays empty boxes for a fraction of a second and then the images are drawn. I never see empty boxes for more than instant.
Honestly, this is the best I have ever seen this behave. I remember praising the excellent scrolling behavior of the iPad TV app a long time ago, but it hasn't been good for many months. Today, it is excellent again. That's nice!
No change in behavior in tvOS 13.2, which I also updated yesterday ... the library still says that I haven't purchased anything. And macOS 10.15.2 also does not fix anything ... the TV app still does not show my library.
I hope the fixes come soon. But I welcome improvements to the iOS and iPadOS apps.