Upgraded Home Assistant from 2026.2.2 to 2026.3.3 last night and it stopped reading the status of my zigbee devices via MQTT.
I'm running HAOS in a proxmox VM and zigbee2mqtt 2.1.1 in a docker container hosted in a different physical with a ConBee2 radio.
To check connectivity issues I had the integration listen for # and saw state updates for my zigbee sensors.
What finally fixed it was going into zigbee2mqtt's settings and disabling and re-enabling Home Assistant integration.
I just saw the 2026.3.4 announcement this morning, so I guess I'm updating again tonight. At least I know a quick fix now.
Next time I'll try that first.
It feels like maybe HA needs to rediscover the MQTT device topics.
I vaguely recall reading something a while back about z2m sending discovery messages when it discovers new devices were added/removed and that's what triggers HA to start looking at device topics.
If that's the case z2m probably also sends the discovery messages when it boots up and starts detecting "new" devices.
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