GP, EZ, and MF's Q'd do not proc any spell effects.

"Gangplank shoots a target enemy with his pistol, dealing physical damage. This ability can critically strike and applies on-hit effects, including Grog Soaked Blade."

I will use gangplank as my example, but its the same with all 3 champions. This spell says it will critically strike and applies on hit effects, great, additional damage. But, it does not count as a spell.

Therefore there is a bug, that doesn't count these three spells as actual spells.

If they work as intended, fine, change the description.

Fizz's Q is the same but it clarifies that spell effects will still proc, although its a spell, so this is redundant information.

"Fizz dashes a fixed distance in the direction of the target enemy unit, dealing 100% AD physical damage plus bonus magic damage. The physical damage applies on-hit effects and the magic damage applies spell effects."

Please edit the game to state that their 3 abilities do not in fact count as spells for some reason.

Although, If they did count as spells and spell effects such as and were to modify the 3 spells, how would this negatively effect game play? The champions aren't known to generally be strong or played a lot, these item options might give EZ a little bit of a boost if he were to go one of these items and his Q could proc the passives.

I dont see why they dont.

One way or another, i believe that the 3 spells at least should have clarification that they can not be modified by any spell effects.