Aaaaaand it's fixed! You should no longer see a "video unavailable" message on some recently uploaded videos. Thanks for sticking with us as we figured it out!https://twitter.com/TeamYouTube/status/1116363608114462725 …
To clarify, YouTube can't mediate copyright disputes & we cannot get into specifics. If you believe the claim is invalid, please dispute it using these steps: https://yt.be/help/TLK2 . You may also want to take a look at info on how content ID claim works: https://yt.be/help/peVV