when stacking multiple quivers from supplementaries mod in a sofisticated storage (a double diamond chest with two gold tier stack multipliers in my specific case) and putting arrows inside them by right clicking them with whatever arrow\s you grab, you can then seperate the quivers and grab the same arrow\s multiple times from each quiver.

I play the reclamation mod pack and was directed to here to report this bug.

So this could be fixed on supplementaries side by not allowing to stash the arrows in the stacked quivers or the reclamation modpack can set quivers to not stack using nonStackableItems config or I believe that quiver is implemented as container item they can set config to not allow container items to go into backpacks using containerItemsDisallowed

I thought I already saw this one reported to Supplementaries, but can't find it, definitely best to report to them, because this is likely going to be an issue as well when combined with other mods that allow stacking of unstackable items. You can also let the pack maker know of the configs they can use to stop quivers from stacking, but they likely don't care that much about arrow duplication (unless of course it can be used to cheat your way through part of the modpack's progression)

Actually hold on this is storage so in that case that last config doesn't apply because storages allow container items and the only thing that can be done without fix on Supplementaries side is disallowing stacking of quivers using that config.

Should I go report this bug in supplementaries then? I could also deliver your advice to the reclamation pack owner.

I don't think infinite arrows/tipped arrows are going to break the pack's progression but anyways I'll report to supplementaries and probably tell the pack owner about your advice.