HUE; dummy thing

I have an old unused hue switch that I configured as a dummy item. So in my HUE bridge this was/is recognized.
In OH I have a rule which copies the value of this (not physically connected) item and sends the brightness value to a few wifi dimmers. This way I can control them as if they are from HUE.
Since a while OH doesnt receive the value, the status of the thing remains unknown (and not offline). What could cause that?

I removed en rediscovered the thing, cleared cash for the 2nd time and restarted and now its status is offline (as expected).

The item is not changing however