I'm scraping the latest uploaded videos from a channel and it's working fine but I noticed that the PlaylistItems.list API is sometimes slow to offer the latest videos. It can take days for a new video to show up on a uploaded playlist's query result.
For example: Today, Sep 07 00:59:07 2017 UTC, this playlistItems.list query is not returning a video posted yesterday at Sep 06 01:26:13 UTC.
The strange thing is that the API has data about the video in question, if asked about it individually using the videoId 0QlUOWbdIWw, and the YouTube playlist also recognizes that the new video exists.
Is there a delay between the video data being available and it being included in the channel's uploaded playlist?
Edit: Although the example I posted is using anonymous requests, my app is issuing them with authentication.