I just downgraded to version 3.24.0 of the addon and all my lights came back again. Weird. Curious if anyone else experiences this loss of lights.
Maybe not the best way, but I downgraded the addon by changing the vesrion in supervisor:
# grep -F version /mnt/data/supervisor/addons/git/a0d7b954/zwave-js-ui/config.yaml
version: 3.24.0
and then let HA “update” the addon to the older version.