OnPlayerLeftRoom() not always called

Schloool

Hey folks,

I am currently working on a project, where I want different things to be executed for all players being in the room while one player left.

Therefore I used the OnPlayerLeftRoom()-method in a context like this:

public class MyLeaveHandler : MonoBehaviourPunCallbacks
{
    public override void OnPlayerLeftRoom(Player otherPlayer)
    {
        Debug.Log("PLAYER LEFT");
        HandleMyStuff();
    }

    private void HandleMyStuff() { ... }
}

However, while testing the callback method was only called in about 5 cases at first. After that, the method did not get called again, also not after restarting the game. I also made sure that all clients are conntected in the very same region. I leave a room using the method

PhotonNetwork.LeaveRoom();

Also, some other callbacks - like the following ones - do not get called at all.

OnPlayerEnteredRoom()
OnPlayerPropertiesUpdate()

Thanks in advance for any helpful feedback. :)