Ammo for throwing weapons

[Armpit_Sweat]

I have noticed a strange behavior of my ammo count, when using 4 stacks of throwing weapons:

When i use all my War Darts / Javelins ( have 0 left, used same kind of weapons in all 4 slots ), i gain some ammo by picking up a random melee weapon

So if I pick up a Bastard Sword - i get 6 Javelins, or 12 War Darts, and i keep a Bastard Sword too. I am not 100% sure if it happens all the time, but it did happen more then 10 times.

If it is a patch feature, it is a weird one

[Belmont]

This bug applies only if you have two or more (EDIT: this might not be true, need more testing) stacks of throwing weapons. If you pick any weapon, be it one or two slots, even other throwing weapons, one of your stacks will be fully replenished.

EDIT: The ammo will only replenish if you fill up all four slots, that means that if you have a two-slot weapon and two stacks of throwing weapons you need to pick up a two-slot weapon to refill one stack.