If the bearing is fully disengaged, when the foot is off the pedal, it should make no noise, since it should not be touching the clutch and not spinning.
Whereas when you are pressing the clutch it will start spinning and thus start making a noise.
It will make a noise when the clutch is fully released if the bearing is still touching the pressure plate and thus spinning a bit, and then it can make quite the whiny, tinny spinning noise.
The reality is that there are not many bits in a clutch which spin *only* when the pedal is pressed. In fact, I can only think of one; the release bearing.
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