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Description of bug

This is extracted from #11768

It's quite unclear that which chain get a new connection or disconnected

And, WS error: i/o error: Transport endpoint is not connected (os error 107); terminate connection 6 is the client force disconnect so I propose it move to WARN level and give a more clear log

khala-parachain node is based on polkadot-v0.9.27 Cumulus which still has this behavior, so it might not tracing bug

Steps to reproduce

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