I think I've figured out the dash bug others are having issue with, or at least I am. When you dash jump off the very edge of a cliff or platform, it executes the jump technique, preventing you doing so later in the leap. It's fine if you are in full contact with the floor and dash off, then the air jump works. But as most players take advantage of leaping as close off the edge as possible, the extra advantage of the jump boots gets lost during the mid-air fall. If you test this, you can see the yellow air jump marks as you dash off the edge.