Check engine RPM´s.
Compare it with the other 190D9 model.
What I mean, is that there is a point that the plane speed on a dive is beyond the engine+propeller efficiency. You are not squeezing more speed, you are reducing it. To achieve more speed, you need to feather the prop.
Also, stabilizing the plane at the end of the dive should be much more difficult with a high reved engine, than with a moderating one. High revs generates a huge gyro effect, who will increase resistance to vector change.
To report this as a bug, it will be better to check planes RPM, and the clock who shows the prop pitch. If both planes show the same behaviour here, then I would look for how much overreving you are applying, but I would expect every plane to seize it´s engine after that kind of mistreatment.
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