[GAMEPLAY] - Gangplank "Parrrley" Does not apply critical damage properly.

{Bug Report}

Server: NA

Type of Bug: Gameplay Related

Description: Gangplank "Parrrley" bonus damage no longer critically strikes.

Image / Video: The video showcases a Gangplank (pre-rework) critically striking a Khazix who has 84 armor. The gangplank only has 179 Attack damage at the time he critically strikes Khazix. However his critical strike with parrley did 395 damage to him. Had the ability's bonus 120 damage not been dealt to Khazix the damage dealt would have been at most 310 (rounded upwards) after factoring in bonus damage masteries and armor reduction.

https://www.youtube.com/watch?v=c1NCFmt-3Fk

Steps to reproduce: Critically Strike while using "Parrrley"

Expected result: The bonus 20-120 damage from "Parrrley" is affected by critical strike multiplier.

Observed result: Damage values from a critical strike by Gangplank are lower than expected.

Notes/Implications: Prior to his rework in 5.14, Gangplank had always been able to critically strike with the 20/55/80/95/120 bonus damage on "Parrrley" - now, being unable to deal this bonus damage severely undermines the non-situational power of this ability, causing potentially significant decreases in damage dealt by 20 (rank 1) and up to 180 (rank 5, infinity edge) mid to late game.

Reproduction rate: 100%

System specs: Lenovo Z585 (Laptop)