Please fill out the following:

- Description
If you use the "playlist" parameter with a combination of videoIds that was not used before the player breaks on first load with "The video is unavailable", if you reload your browser to player works as expected.
To reproduce the error, add a new video id in the playlist parameter and reload.

- API request with parameters used (DO NOT include your credential)
Example for iframe, with iframe JS API is the same result

1)
<iframe id="ytplayer" type="text/html" width="640" height="360" src="https://www.youtube.com/embed/M7lc1UVf-VE?autoplay=1&playlist=tNRNN7fZq_g,BwXr_H3MuQQ,M7lc1UVf-VE,tNRNN7fZq_g" frameborder="0"/>

2) add, remove or change sorting of videoIds so the playlist is different than before, but always use a new combination!
<iframe id="ytplayer" type="text/html" width="640" height="360" src="https://www.youtube.com/embed/M7lc1UVf-VE?autoplay=1&playlist=tNRNN7fZq_g,hE5ewXndYkQ" frameborder="0"/>

- Result (copy and paste a JSON response you received)
"Dieses Video ist nicht verfügbar" / "This video is unavailable"

- Expected result
Working playlist with player on first load

- Is it 100% reproducible?
YES

- Reproducible API explorer link
see above

Issue 249707272

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