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The boss is broken. It can happen when the motor mounts are bad and the car is driven/shifted hard. It can be very difficult to fix since the case is made out of aluminum. Best bet is to find a reputable aluminum welder.
The transmission boss brace is actually a preventive measure so the boss won't shear off.
I have also made a custom thicker, threaded plate that will actually replace a broken boss, so the shifter rod will actually bolt directly to the plate. I just shipped one to MOUNSOUN MOTORS this week. He should have received it yesterday. Maybe he can comment on how the repair went.