Got it.

Maybe I should get some sleep at least once a week

But I had mixes of sub-playlists and tunes (withing one playlist) before and I can't remember ever seeing this symbol.
On the other hand ... I never go that deep in the playlist.

II think I was just confused - after JEmplode changed the "tunes" to the symbol.

So my "injection" is workling after all.

Thanks.