I suspect you're using DirectX/Direct3D. Don't use it unless you absolutely half to.
IL-2 1946 has an engine that was written in OpenGL. The Direct3D version of the game has a few notable bugs (including that one) and has fewer features capable.
OpenGL is also the only mode that allows for the improved "Perfect" rendering mode which is much more visually stunning although less so by today's standards.
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