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I'm going with something to do with the pressure plate or throwout bearing.
There is virtually zero clearance between the clutch disk and the mating surfaces on either side of it when the clutch is disengaged; disengagement merely allows the clutch plate to spin freely between them. Something lodging in there and rattling when the clutch is engaged is pretty much impossible.
OTOH something lodging in a dumb place in the pressure plate is definitely possible, and could definitely mess with clutch actuation in a variety of ways.
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