I agree. That one raised my eyebrows. Neither known amongst the masses nor the top of the heap of classics worthy of resurrection (at least IMHO).
I'm surprised too, but very pleasantly so. It's always been a favourite of mine and I'm guessing I won't be alone in that even though it seems to me that most fans who know it are at best lukewarm about it. For me, on its parent album it shines out.
But like any band worth their salt they won't, and shouldn't, choose their set based on what some fans' notion of "classics" are. They'll include enough to keep the broader fan base happy and good on them for leaving some space for dusting off less-expected ones.