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Name of API affected: YouTube Data API v3

Issue summary:
The API is not returning up to the last four videos in the playlist I am attempting to grab from Youtube. This is true whether I'm using the Javascript client library or https://developers.google.com/youtube/v3/docs/playlistItems/list#try-it.

Steps to reproduce issue:
1. Use playlistItems.list to request video snippets from playlistId UUejBXQPfVRXdRTn1wkRO09A, maxResults 12. No OAuth necessary.
2. Get nextPageToken and repeat.
3. Compare number of results with pageInfo.totalResults.

Expected output:
For pageInfo.totalResults to match the number of total results.

Actual results:
pageInfo.totalResults = 22. The number of total results is 24. The number of videos on the playlist at present is 26.

Notes:
You simply don't receive a nextPageToken once you've gotten 22 results, but it will still retrieve videos after the 22nd if the maxResults allows for it. That is, if maxResults=2, you get 22 videos. If maxResults=5, you'll get 25 videos. And if maxResults=7, you'll receive all 26 videos.

Issue 35178193

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