An update: Twitch streamer Kenastion got a notification from Twitch stating that parts of his stream that use the song Kora Duet were muted. This wasn't a copyright strike, more like a preemptive action on Twitch's part to prevent the VoD from being susceptible to a DMCA takedown request should the copyright holder every try to issue one. It's an odd CYA thing on Twitch's part.