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
@TeamYouTube Can you not use custom thumbnails for Premieres? I just launched my first one and it keeps switching me back to an auto generated thumbnail (and not a very good one at that)
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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