Not Ranked
You have no problem, what you are hearing is neutral rollover rattle and is completely normal. When you are idleing you loppy engine the gears chatter due to the backlash in them. When you disengage the clutch (push it down) the transmission input shaft quits turning and therefore you gears are not turning and voila you noise goes away. The sound can be described as loose marbles.
I have experienced in every manual transmission I have owned to some extent.
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