I'm sorry as I know I'll get zeroed but, is this a troll post? Suppression grenades prevent enemies from using abilities for a short time. They don't have any description that says they do anything at all if the ability is already active! So surely fixing this would mean removing the grenades ability to suppress already active abilities. I think this one is a case of be careful what you wish for.
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Suppression Grenade does stop supers even after they're already active. It will also cancel an enhanced jump mid-way.
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The beginning of OP's video is how the suppressor grenade is supposed to work. Towards the end of the video is a problem indeed because it was not having its intended effect.
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Watch the entire video.