So I don't know how many of you have noticed, but while waiting to respawn sometimes it's handy to Chuck a synth on for your heavy or special ammo, my self and a few people I know have done this, the synth gets taken and you enter the 5 min cool down period but upon respawn it hasn't actually added any ammo
I went back into the inventory and the synth has been taken but not rewarded
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The synth will always be taken from your inventory if used but if you are dead there is simply no one to transfer ammo to because well you're dead so don't waste them when you're dead and I'm very certain bungie has no plan of changing that anytime soon