Zoe Q miss
Zoe Q just goes straight through enemy champion without doing any damage. https://www.youtube.com/watch?v=huoogUOjZM4&feature=youtu.be
Zoe Q just goes straight through enemy champion without doing any damage. https://www.youtube.com/watch?v=huoogUOjZM4&feature=youtu.be
To me it looks like you just barely missed the Yasuo. I dont think this is a bug.
You need to aim at characters feet because of angle the camera is at.