I'm not the one that made this video but the original author who posted with on reddit asked for someone else to post this.
The video clearly shows the player losing all momentum while activating a super above 30 fps.
Reddit post: https://www.reddit.com/r/DestinyTheGame/comments/8kllcq/d2_pc_bug_super_momentum_is_lost_at_higher/
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Cheers. I've never much liked the total loss of momentum on PC, but I figured it was just how it was. Knowing it's a bug makes me really hopeful it can be fixed eventually.