We've seen similar reports and are working hard to fix it. Appreciate your patience in the meantime.
@TeamYouTube This whole thumbnail issue is still driving me mental (custom thumbnails not staying). So I notice that it's only on my livestream thumbnails. it shows the custom thumbnail on my creative studio but is shown to be my default livestream thumbnail in sub view or edit.pic.twitter.com/s35a4g7Q8T
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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