To summarize, without having done any updates or restarting anything, suddenly my Blue dimmers became uncontrollable from HA, but they work fine directly from the Z2M UI.
I’ve since updated HA, Mosquitto, and Z2M, but the problem persists. There’s communication going on, as evidenced by the fact that Z2M works directly, and things like power are reported all the way back to the MQTT integration. But things like the on/off control are grayed out.
I’ve seen this as well - something is wonky with the way that the latest editions of HA and z2m interact via MQTT. A quick restart of z2m brings everything back for me (I leave MQTT and HA running). It happens every time I update HA, so I’ve just gotten used to updating HA, then restarting z2m.
My dad’s system is seeing the same thing with the ring2mqtt addon (he doesn’t use z2m). It requires a restart of the server itself to get it back online. Just restarting the mosquito addon doesn’t do it.