On-hit Bugs (Guinsoo's Rageblade, Titanic Hydra)

There seems to be some sort of bug related to the on-hit mechanic of the game.

First to report is Ezreal's Mystic Shot - it doesn't stack like a basic autoattack like it used to before 5.23, it makes me to think this is a bug because when you're at 8 stacks it still does the intended AoE damage. Second would be Mordekaiser's Mace of Spades and its interaction with Titanic Hydra - sometimes it does the cone of damage and sometimes it doesn't. I couldn't find a pattern, it's totally random.

I hope those get fixed soon. Thanks Riot!