Hi,
The same for me. Newly created playlists don't show up on my channel...
It was already reported here ( https://productforums.google.com/forum/#!category-topic/youtube/how-to-use-youtube-features/FNb5Jh6I-HM  )

Where an update says that the problem was solved. But, obviously,  it is not the case... This is a real issue and a real pain...