In fact, we know for sure that they aren't.
Actually, we don't. We know that the playlist isn't named with unicode characters. But the tracks might be. And if it can't show the tracks, mightn't it think the playlist was empty and not show it? Of course, you know more about the internal workings than I do.
Peter covered that with:
"And in v3, unsupported Unicode characters appear as little squares; they don't disappear altogether."
So it can show the tracks, even if the have Unicode characters that it doesn't have glyphs for.
Or at least one would assume that is what it would do
