Third party Embed Image appears and then disappears on some videos

Not totally clear what you’re reporting. Do you have specific reproduction steps, screenshot or similar?
 
I was using Chrome when I first checked, but on iOS, and the issue doesn't exist there.

However, it seems that this would be a YouTube issue:

1524530005210.webp

Even if you go to the "Embed Video" overlay on YouTube itself, you get the same issue:
1524530214974.webp
 
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