NetMulticast RPC broke PlayerController's connection

If add NetMulticast method to my PlayerController class and call it on Server, weird things happen.

On client, PlayerController loses Player and NetConnection fields (they become nullptr), on server Player are continue to be old.

I still can run RPC methods on client, but can’t on server (due to lack of owning connection on client, perhaps).

Due to lack of Player field, client broke fast. It lose viewport and start to show black screen. Server side works like all is ok.

If I set old values to fields, client can call rpc on server, but it brokes again immediately on client.

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Thanks