Almost certainly carb related, since flooding is what happens when you drop the bike. But I've also had a sidestand switch jam after a fall in sand. Then you spend some time messing around trying to figure out what's going on, in the process of which you put the bike on and off its stand, whereupon the switch randomly starts functioning again.
If you haven't already done so, eliminate this cutout now rather than waiting until it drives you crazy some day. Or not: disable the switch and there's that embarrassing moment when you take off from a start with the stand down, then wonder what the grinding noise is or dump the bike in front of a crowd of non-impressed locals. Your choice.
Mark
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