I have a newly created RasPi on Raspian running the latest version of Node-Red and Mosquitto - all freshly installed.
Everything is operating fine BUT ...
When I deploy a change, the status indicators on the MQTT nodes changes to 'disconnected' and never show the reconnection. This is clearly wrong as I can see messages appearing via the debug node, and everything appears to operate.
If I refresh the page - the correct status is shown.
Any ideas?
I am using Windows 10 with Chrome browser (all latest) to edit the system via WiFi to the RasPi.
It may well not make a difference, but worth trying as it will make sure you have a consistent set of tools. Uninstall nodejs first. It has to be something like that as this is not a problem that others have.