@Talven81 - whoops. No, it isn't. I saw the versions and assumed client.
Just checked this out. I am able to reproduce this bug in both 13w48b and 13w49a in Windows 8.1
This ticket appears to be specific to the OSX version of the game, but the ones for Windows are being closed as duplicate. The bug still exists.
@Talven81 - whoops. No, it isn't. I saw the versions and assumed client.