Hi, without getting too deep into the details and logs, I think this is related to this issue: MQTT not reconnecting on edit if only only one mqtt node using the config node · Issue #3927 · node-red/node-red · GitHub which started here: MQTT not reconnecting if only only one mqtt node using it
And here is a PR that fixes it: fix single subscription mqtt node status by Steve-Mcl · Pull Request #3928 · node-red/node-red · GitHub
Please let me know if adding a 2nd subscription to some other topic fixes this
