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Relates to paritytech/substrate#7794 (comment). While it is certainly desirable to investigate such failures further, not panicking seems like the right thing to do as a first step in any case. The errors will still be visible to client code and can be reported, allowing client code to fail more gracefully, as e.g. substrate is doing by just disabling Mdns, thereby logging the error. It would be great to get this into a patch release.