Guard Break did get a patch, but I feel it is still broken. As I understand it, you have to mash the button about half a second after you have been guardbroken. However, if you are in mid-dash of guardbreaking, and someone guardbreaks you as you're attempting to guardbreak them, you are guardbroken with no chance to guardbreak back. It essentially punishes you if you either both hit the guardbreak at almost the same time or try to shake off the guardbreak with fast reflexes. It only seems to reward you if your reflexes are slower and you are lucky enough to not get hit by a heavy attack or light spam. This happens even if there was no parry or deflect to open you up for a guardbreak.
Simply allowing a counter-guardbreak during the entire window, not just half a second later, would reward players with fast reflexes to successfully counter