PhotonChat Behavior confusing

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Im quite confuse how PhotonChat works

As in this screenshot
https://drive.google.com/file/d/1UkvkU7LZPbKMZ7GSnhY0y7bX1QWyYHF_/view?usp=sharing

My pun peak CCU is 233
While my chat CCU peak is 456

I feel that the chat code is duplicating? PUN automatically disconnects for a certain time. does the chat disconnects too the same period the PUN disconnects?

And how can I disconnect Chat?
What is the code should I use.
this one:
chatClient.chatPeer.Disconnect();
or this one:
chatClient.Disconnect();

whats the difference?
pls help
thanks