At 5:28-ish AM on 3/18/2018 I was playing a hanamura 2CP game on defense.
They rolled in and capped the point before anyone could react at all. It was .8 ticks to victory so things were tight for sure. But they literally touched point and capped within the time it took me to shade step from the health pack to the point.
In my overwatch experience this is extremely irregular. No one was on the point at the time, and half their team touched point, and by the time I would normally have been on it, contesting, they had already won.
This seems like a cap-rate bug to me.