A joins the room first, B joins the room later. A joins the room first, hangs up first, then B's audio can't reach the system, and the page's audio can reach Android app

Openvidu2.20.0 Our company’s point-to-point voice has a function of group voice. When the page clicks the group voice button, the openvidu address will be generated to Android app and then added to the room. But now there is a problem. The system sends an audio request to AB device. A joins the room first, B joins the room later. A joins the room first, hangs up first, then B’s audio can’t reach the system, and the page’s audio can reach Android app. On the contrary, B joins first, A joins later, and B hangs up first, A’s audio can’t pass the system, but the page’s audio can reach the Android app. Where does this problem occur