iOS - record audio but BGM wont play correctly

[norman93sun]

There is a project: using AgoraRtcKit for video call, and AudioKit for recording audio after exit room.

Step:

1. Join channel as a broadcaster, and set agoraKit.setAudioProfile(.default, scenario: .education)
   If set scenario with gameStreaming this issue wont happen
2. Leave channel and go to record.

Issue：
When it's recording, there's a BGM palying with no sound.
It's working normally if go to recording directly without start a video call. And it's working if we set scenario with gameStreaming.

So far we found this happened on a few of devices: iPadAir4 , iPadPro12Inch4
There is a demo base on OpenLive-iOS
I'd appreciate it if someone could help me!