@YouTubeTV seems to be a problem lately where, when joining a recording in progress, I can’t start at the beginning any more. Pretty certain used to be able to and this skip commercials to catch up to live. Doesn’t do me any good, on my DVR, to only be able to join at Live.
We recommend getting in touch with our live support team who can look into this further for you. Contact them here: https://yt.be/help/q86B