[Bug] Missing/`''` values in Playlist Response

[n-ce]

Describe the bug

When trying to fetch OLAK5uy_ playlists, a lot of essential fields such as author, authorId, and playlist thumbnail has missing values.
e.g. /api/v1/playlists/OLAK5uy_nh7Py_NVbO3OLxpNJ8bxmb-fqsLuyhOYA

Steps to Reproduce

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Additional context