Of almost a dozen DOH transits on QR the past 18 months, only once did I experience this .. and was it ever a pleasant surprise..the flight was CDG - DOH - BKK. I had flown CDG - DOH-Asia many time and this was the only time experienced this.
I honestly thought it was a mistake that the exit door to the terminal was open because not all were exiting that way..it was more like a mad rush A380 mob scene and the door kept hitting everyone! But it was a nice surprise. Pretty rare where I have seen no security needed for transit at an INTL airport anyways.