Konami announced in a tweet that a patch fixing the Quiet bug in Metal Gear Solid V: The Phantom Pain is out now for Playstation 4 and PC.
Patch available PlayStation®4, Steam®(PC) that corrects Quiet Bug for MGSV:TPP : http://t.co/HJdO9xvXhh Other systems still in progress
— Konami (@Konami) September 14, 2015
The game breaking bug could corrupt your save files when bringing Quiet with you during mission 29 or 42. In the link associated to the tweet, Konami also says the following about the PS3, Xbox One, and Xbox 360 versions of the game:
“For other platforms (PlayStation®3、Xbox 360®, Xbox One), the issue has been fixed internally and is currently under final testing before distribution. We will post an announcement as soon as the patch becomes available. Thank you once again for your patience.”