Quick Cast stops the gun after using spell even if the left click is being held down

[AruruQn]

Observation:
To reproduce, set Bebop Bomb to quick cast.
Hold down the left click.
Cast Bomb on an enemy.
The gun stop shooting even though the left click is still being held down.

Ideal:
The gun continue back shooting after casting bomb

Note:
Instant cast has ideal behavior. Quick cast has this bug both on abilities and items