It does look like the same problem, after reading your post I realise that opening the config node, clicking Update and deploying makes the error disappear, if I then refresh the browser they come back.
As both you and @gerry are seeing it on 3.02 it isn't a 3.1 beta problem so I will re-open your thread and carry on over there. If anyone has any ideas how to diagnose what is going on then please join us at When I restart Node-red, or refresh the browser, MQTT broker & nodes show error
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