Flint&Steel applied to a creeper through a dispenser doesn't light its fuse

Applying flint&iron through dispenser seems to consistently follow parity with applying it by hand - lighting blocks, mobs, campfires, TNT, portals and so on. Currently the only exception is lighting a creeper fuse which is only possible by using it by hand - flint&steel used through dispenser will just set the creeper on fire without affecting its fuse.