Guild Wars 2

i have run into an issue dont know if this is intentional. Is it true that promoting rare crafting mats with mystic binding agent is supposed to provide multiple promotions with one go. for example i tried promoting 12 destroyer cores to 6 lodestones using 12 cores, 6 dusts, 1 mystic binding agent, and 1 crystal. Is that not a valid recipe

The Mystic Binding Agent is used to promote rare crafting materials in order to “batch” together a number of promotions together into one promotion. The Mystic Binding Agent replaces the Bottle of Elonian Wine in the regular rare material promotion formula. The batched formula allows you to combine 8 slivers into 4 fragments, 6 fragments into 3 shards, 4 shards into 2 cores, or 2 cores into 1 lodestone, where as the original formula would produce 2 to 1 on all tiers. The batched formula still will only take a single dust and a single crystal.

Source:

http://wiki.guildwars2.com/wiki/Mystic_Binding_Agent