[BUG ?] OnSessionListUpdated not called When GameMode = Shared

Hi, I use OnSessionListUpdated as what https://doc.photonengine.com/en-us/fusion/current/manual/matchmaking#join_a_session_from_a_lobby said.

When I use Single mode, as 'JoinSessionLobby(SessionLobby.Custom, lobbyId) -> StartGame(GameMode.Single)', OnSessionListUpdated called success everytime when any session has update.

But when I use Shared mode, OnSessionListUpdated will be called just one time after JoinSessionLobby. After that, any updates of session willn't let OnSessionListUpdated be called.

Is it a bug ?