In my case my main hub is notifying me of an update to 2.3.0.123, but when I click that link it shows there is NO update. I see that the update has been withdrawn. My question is: Will this sort itself out later or does someone need to do something? My dev hub does not show a update waiting at al…

If the System Message keeps showing there is an update, and you don't want to see the message, there is an option to dismiss/skip the version. That way the System Message is cleared.