Have you checked if the 'Auto add' setting on your playlists is enabled? More info here: https://goo.gl/bE7AMr . Hope this helps.
@TeamYouTube Any idea when playlists are gonna be fixed?
I miss videos being added to them automatically.
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I have, in fact, the playlists were going just fine till just over a week ago. Old videos that are private have even been added to playlists unprompted due to this error.
End of conversation
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