I knew I kept my old raid boots for a reason. Equip the boots that give you extra heavy ammo from year 1. Pop a heavy synth and then switch back to your new boots. You will have a few extra sleeper shots.
So it's not so much a glitch, but most boots either offer extra rockets or machine gun ammo this year. you would think to carry more fusion ammo would do the trick, but not so much. I preferred the old generic extra heavy perk myself.
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This has always been a thing. Do the same thing with a heavy LMG that increases ammo size. Pop a synth, reload, and switch back to stability perk (or whatever you prefer). Your ammo won't decrease. Did this all the time on Skolas.