Muramana doesn't work on Gangplank barrel

Spell effects are effects that trigger whenever a champion inflicts ability damage. As of V7.22, this now includes abilities that otherwise behave like basic attacks.

Gangplank can attack a Powder Keg with basic attacks and Parrrley Parrrley. If he destroys it, the keg no longer grants kill gold but instead explodes, inflicting the triggering strike upon all nearby enemies, ignoring 40% of their armor, Slow icon slowing them by 40 / 50 / 60 / 70 / 80% for 2 seconds, dealing 60 / 90 / 120 / 150 / 180 bonus physical damage to enemy champions and applying spell effects as an area-of-effect ability. Magic damage on-hit effects are not applied. If Gangplank destroys a Powder Keg with Parrrley Parrrley then every enemy killed by the Powder Keg will also be plundered and give Gangplank Silver Serpents Silver Serpents as if he had killed them with the initial ability.

applying spell effects as an area-of-effect ability.

I even tested it yesterday and it didn't work

Riot pls do something about. (Ps. Let Gp barrel cost 1 mana so i can star tear and muramana quickly)