0.104 Problem with restored entities and the attribute hidden / customization of restored entities

I have a Samsung Laser Printer which is not always on. Since 0.104 all my sensor.samsung_* entities are restored and shown in the UI, as described in https://www.home-assistant.io/blog/2020/01/15/release-104/#improved-entity-handling-on-startup.

The entrie:

 sensor:
   hidden: true

in my customize_domain.yaml does not have any effect on the restored sensor.samsung_* entities.

When I remove the restored enttites via the UI, as described in the link above, they reapear when HA is restarted while the printer was on (due to the automatic discovery of HA).

Is there a way to hide restored entities permanently (customize_domain.yaml does not seem to be the right way)?