iPadOS 16 Beta8 VTCompressionSessionEncodeFrame error kVTVideoEncoderMalfunctionErr 12912 the code works fine on iPadOS 15

Device Info: iPad Pro 3rd（iPad13,4） iPadOS：15.5 I start a broadcast server at 13:06:00, and system called 'broadcastStarted' 13:06:03 system called 'broadcastFinished' and 'broadcastError with no error message' 13:06:10 system called 'broadcastStarted' again At the same time, I didn't do anything ！ WHY ? ? ?