I had the same thing this morning and none of the devices worked, the deCONZ integration was empty of device icons in the ‘Integrations - Configured’ page but visible if I clicked on the deCONZ integration. I deleted, restarted and added, worked fine but on restart, had the same issue.
As this only happened overnight, I thought, I had installed custom-updater yesterday so I uninstalled that and restarted, added deCONZ again and all works fine on reboot.
Can’t be 100% sure it’s that but with custom-updater running/installed HA took a long time to restart and deCONZ is working fine now