Does Swift Cast work on any skills?

[Chocolys]

I beg you to try again. Swiftcast will be used up by instant cast spells; such as, bio, aero and ruin II.

I just did again on both my WHM and SMN, and Swiftcast was not consumed by instant spells when I tried:

WHM: Swiftcast -> (Checking the buff is up) -> Cast one instant healing skill -> Swiftcast Buff still up -> Cast a non-instant healing skill = Instant cast.

SMN: Swiftcast -> (Checking the buff is up) -> Cast Eye for an Eye (instant spell) on my Chocobo -> Swiftcast Buff still up -> Cast Shadow Flare (non instant) = Instant Cast