Clementine does not play next song when logged in with another user

I've set up PulseAudio to mix sound from different users as explained in this other question, and it works for me.

But I still have one problem:

• Log in with user A. Open Clementine and start playing music
• Log in with user B. I hear music from user A correctly.
• But when song finishes, next song in the playlist is not played.
• I switch back to user A (Clementine remains open), and next song is played automatically.

I've tried Sayonara player and has the same problem (it is a Clementine fork so I guess it's normal). I've also tried Rhythmbox and I don't have this problem.

I've played with some Clementine settings but no effect.

Some tip?