Demand Gen and bad Youtube placements

I'm running several Demand Gen campaigns and i'm getting very bad results due to Youtube placements. I have ad groups with 500-1000 clicks from Youtube over the course of 2 weeks and they generated 0-1 conversions, see attached. These are regular Demand Gen ads, no videos. The ads and campaigns worked great when it was Discovery but are horrible as Demand Gen.

Is there a way to block these? The reports don't give the exact URL of the video or the channel.

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