Log unclear: referenced entities not available, when it is...?

Since a couple of days I get a log about a Z-Wave device. It says the entity is not available, when the device is alive and entities are named correctly.

I can’t seem to figure out where this so called not found reference is called. I checked all automations and everything seems correct. The log is not really helpful in this case.

Can someone tel me where else to look to solve this issue?

Logger: homeassistant.helpers.service
Bron: helpers/service.py:301
Eerst voorgekomen: 2 september 2024 om 20:19:04 (4 gebeurtenissen)
Laatst gelogd: 08:06:24

    Referenced entities switch.attic_double_switch_boiler_light are missing or not currently available
    Referenced entities switch.attic_double_switch_ceiling_light are missing or not currently available