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TMS320F28051: Wake up requirement from halt different than standby

Part Number: TMS320F28051

To exit from Standby all I need is a low on a GPIO and the code will then continue.

When trying to exit from Halt however it seems I need a low then high to exit.

When I push my button in Standby mode the code will continue.

In Halt mode I need to push then release the button.

Is this expected behavior?

This is a problem because I cannot determine who caused the exit from Halt by reading the gpio port.

Am I forced to use standby in this case?

Thanks