Electricity moves really really really fast. A momentary connection is all it takes.
I've popped two ESCs doing this.
One I blew the capacitor (cheap fix, 10 minutes) the other fried it's guts (expensive fix, 4 days to get a new ESC)
FWIW it was a SP Gt2.0 lpf that I blew the capacitor on, check yours to see if that's causing the issue.
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