Consider "toning down" the error UI when unable to deserialise values

[JFlath]

At the moment, we report this as Errors were encountered when deserializing this message, which is true, but also doesn't account for the case where the data is actually just raw bytes and so this is expected. We also then show the actual bytes almost as a footer to the list of errors, so it's easy to overlook them.

Perhaps we could emphasise the raw bytes in these cases, and then list that we were unable to match them to any common encoding below?