I don't think this is a bug exclusive to 4.09m, but I will report it anyway.
Take a P-38 up high and you will notice that the contrails for this plane are not appearing DIRECTLY behind it like other planes. The contrails are actually appearing ABOVE and behind the plane.
I have screenshots if you would like to see them. Obviously, this is in a totally unmodded 4.09m.
Aviar
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