I'm having the same issue. I'm trying to download stream using AVAssetDownloadTask and play the same url asset in AVPlayer simultaneously - according to Apple docs - https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/MediaPlaybackGuide/Contents/Resources/en.lproj/HTTPLiveStreaming/HTTPLiveStreaming.html#//apple_ref/doc/uid/TP40016757-CH11-SW11 this should work. And if I go with only downloading stream (without playing) - it works with no errors.

Same issue here. Waiting for a resolution.

We're experiencing it again too