That's odd. Can you file a feedback report with screenshots and any other details: https://goo.gl/WdI0BK ? Thanks!
@TeamYouTube Unter iOS fehlt seit neustem das App Icon der YouTube App
Neuinstallation bringt nichts. / The Icon of the YouTube App for iOS is missing since a few days
Reinstallation doesn‘t fix it.pic.twitter.com/XLLQCSteYT
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