When facing anything at a 45 degree angle, dash inputs that go nearer to the centre of where your cursor is immediately attracts to it in a straight line (other heroes with dashes behave the same way).
In this clip, i demonstrate dashing while standing still then dashing while moving. Take note how when inputting a left and upwards dash, the character goes straight towards the target.
Unless im mistaken and this is intentional then ignore and delete this post, but this makes dashing extremely counter intuitive and strange.