Thanks for bringing this to our attention. Have you tried uninstalling and reinstalling the app to check if there's any difference? Also, please notice if this is happening when you switched network from WiFi to mobile data and vice versa. Keep us posted.
@TeamYouTube iOS 12.1 iPhone XS Max. I watch videos and turn the volume up and the big boxy volume hud still pops up along with the white line along the top. Kinda annoying just thought I’d let you guys know 
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Does it on both mobile data and WiFi. Still happens even after deleting and reinstalling.
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• iPhone XS Max iOS 12.4 •