IsFlyableArea() + [flyable] conditional bugged in 7.3.5?

[sezz]

Both return false on a character in Pandaria (Kun-Lai Summit) who has Artisan Riding and wasn't able to fly in Pandaria before 7.3.5, but correctly return true on those characters who had Wisdom of the Four Winds before the patch hit (which is now gone, because it's not required anymore).

Did anyone else notice this/is there a alternative for IsFlyableArea?