I have come across a few cases where a hub variable is used in a required expression and doesn't show up as "in use" in the hub variable table. Is this expected ?
Contrived example to demonstrate:
I also have a hub variable showing as unused even though it is referenced in a Room Light instance in a "limit activation" condition. I didn't try to repro that one, though.
Here's an example of RL where I see this issue, but for a Number type variable... In this example I only defined a Means to Activate, did not bother with anything else, but adding devices to automate etc doesn't change anything it seems.