If you're using the YouTube app on Android, we're aware of an issue with tapping on the progress bar to skip forwards/backwards. Workaround: you can still hold and drag the red dot on the progress bar. Will share another update once it's fixed!https://twitter.com/cordycepshumor/status/1019506431916150784 …
Thanks for letting us know, we're passing this along now. Can you also submit a feedback report from the account and device experiencing the issue? Here are the steps: https://goo.gl/WdI0BK . That should help us investigate.