No, it may have been broken/unintended but the fix should be that it doesn’t let you mine not that it kicks you off your mount dropping you however far down. Many nodes are on the sides of mountains where you could barely ever land to mine them to begin with, hover-mining finally made those nodes accessible so it was believable that it was intended. I can live with no-hover being intentional, but it shouldn’t pop you off your mount rather give you the old “you can’t do that while flying” error message.