Playlist created in web interface not present in standard interface

Hello!

As subject, some days ago I started to use the new Kodi web interface since it’s greatly improved.
I created a new normal playlist with only a song inside, just to try.
Today I tried to find the playlist in Yatse but I found nothing in the menu File/Playlist; so I switched on the TV and I tried to check on the standard Kodi interface: no playlist in the playlist music menu. I checked back on the web interface and the playlist was still there… what am I missing?
I’m on Raspberry 2 + OSMC + Kodi 17.

Thanks in advance
Alex