Why is the response for this upload playlists - UUbLd_GVzZaFSb7ZqY0iz2TA - is missing the 2 latest video uploads (both uploaded 8 months ago)? It doesn't happen with the other upload playlists I've checked.
The query using Google's API explorer:
The upload playlist for that channel:
https://www.youtube.com/playlist?list=UUbLd_GVzZaFSb7ZqY0iz2TA