This happened for me once as well. It has not been reproduceable though.
Essentially what I did before it happened (this was on the previous beta patch, not the most recent) was to select the Dogfight - Allies Advantage quick mission and select a different plane for myself to use (Spitfire Mk.I). Then on the new pre-mission screens, I opened the plane selection menu, which was broken. That menu always reset to the mission default aircraft (fixed in the latest beta patch), so it insisted on choosing a Hurricane. If you tried to change the aircraft, it didn't matter, it would just reset to the default anyway.
So to this point, I'd selected one aircraft on the first set of menus and then the second set of menus had reset me to a different aircraft. I then started the mission and the first thing that happened was every enemy aircraft in the level simultaneously self-destructed.
Likely the cause is completely unrelated, but hey, the steps are there just in case. As I said though, not reproduceable.
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