Synth Charge inconsistency bug

[hs0003]

Synth Charge says it'll deal +200% damage on the last shot(1k damage becomes 3k damage), IF the pistol has 6 or more shots in it's magazine.

Despite that description IF you use magazine size mods to push a weapons magazine size from under 6 to 6, it DOESN'T activate on the last shot.
AND if you use a riven with negative mag size to push a weapon with 6 or more under 6 shots, it DOESN'T activate on the last shot.

In short, you CAN'T use mods to make Synth Charge work, but you CAN use mods to stop Synth Charge from working. It should be one or the other.