Yasuo High Noon Chroma Visual Bug
First of all it's more of a visual bug rather than a bug, but it still has the word "bug" in it.
The thing was when I played Yasuo (High Noon Chroma Amethyst) when I e+q I noticed when the game detects you are doing an e+q, in mid-action the skin is going back to the normal High Noon skin (without chroma) but when the animation is about to end it goes back to what chroma you have. I dont know if it's for all chromas but I can surely say it's for the Amethyst one. 