Ground resonance -
AFAIK never happened on a 332L so highly unlikely. It has rolled over to the left, most likely cause is application of a lot of right pedal for some reason (maybe not monitoring pedal position). With no pax and not much fuel, and cyclic just slightly left of centre, it will roll over. Or it will roll over with cyclic neutral and wind from right (with full right pedal in each case).
Since tail servo cover is missing, perhaps maintenance intervention caused an issue with tail rotor control?
HC