Yeah, years ago I messed with the worm drive that presses the clutch push rod.
DON'T FOR THE LOVE OF GOD DISMANTLE IT
Tiny 2.5mm ball bearings all over the place!
As has been said all wet multi plate clutches will have clutch drag rotating the rear wheel while on the centre stand.
If it can't be stopped with a light press of the rear brake then there may be an issue. (Don't try stopping it by hand)
As the oil warms up the drag effect will reduce and the wheel rotation will slow until it will just creep.