Hornet Barrage empties to 0, when it should have 3 more charges

[geotavros]

Video that demonstrates the bug:
https://www.twitch.tv/octa_chi/clip/UnusualBrainyMoonLitFam-GmIwhleUUi0AlrW8

Sometimes when activating Hornet Barrage which has 4 charges, during reload of the main weapon, its charges instantly drop to 0.

Steps to reproduce:

1. Add the following code into scripts/vscripts/challenge_one_hit.nut

function OnGameplayStart()
{
	marine <- null;
	while ( ( marine = Entities.FindByClassname( marine, "asw_marine" ) ) != null ) 
	{
		for ( local weapon = marine.FirstMoveChild(); weapon != null; weapon = weapon.NextMovePeer() ) 
		{
			if ( weapon.GetClassname() == "asw_weapon_hornet_barrage")
			{
				weapon.SetClip1(5)
			}
		}
	}
}

2. Load a map and activate One Hit challenge
3. Pick Crash, two Grenade Launchers, and Hornet Barrage.
4. Start mission
5. Shoot GL to empty it, perform fast reload by pressing R and at the same time activate extra. This step is necessary but doesn't trigger the bug yet.
6. Again, Shoot GL to empty it, perform fast reload by pressing R and at the same time activate extra. This makes Hornets charges drop to 0.