Received OnSerialization for view ID XXXXX

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Hi we are working on a unity game with this technical specifications:
Unity 2019.4.25 (LTS)
Photon PUN 2 v2.30

After connecting to a room we got a lot of debug warnings like:
Received OnSerialization for view ID XXXXX We have no such PhotonView! Ignore this if you're joining or leaving a room. State: Joined
It seems something keep buffered in room but I don't know how to clean it up, I don't use PhotonNetwork.Instantiate but instead I use PhotonNetwork.AllocateViewID sending an event to other client when a new Player Join with it informations/settings and every one instantiate a copy of it, I need to call something for clean up photonViews when someone leave? I'm missing something else?