Looks like you're in a small and brief experiment (.3% of viewers for a few weeks) so you're seeing auto-generated thumbnails instead of custom thumbs. This is part of an effort to test/improve auto-generated thumbnails for the many creators that use them: https://goo.gl/A7oDmr
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Replying to @TeamYouTube @JamesTurnerYT
I’m in the small sample too and I don’t like the experiment. At least for me it doesn’t make any sense cause all the channels I’ve subscribed to, the creators make amazing thumbnails and the auto-generated ones are just disappointing. I wanna see those fun thumbnails again pleasepic.twitter.com/iU0zZPtkTr
11:31 AM - 28 Jun 2018
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