That's a good news!
I upgrade devices to iOS 15.1 beta 2 (19B5052f) and this issue doesn't happen.
By the way, my devices are iPhone 8+ and iPhone 7.
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I upgrade devices to iOS 15.1 beta 2 (19B5052f) and this issue seem to be fixed.
And my devices are iPhone 8+ and iPhone 7.
The official iOS 15.0.1 is released. Unfortunately, it seem to no any patch about fairplay playback.