I too have encountered this, very intermittent issue. The one time I witnessed it happening to another play from my view angle, it appeared as if (in that particular case) the plane's frontal landing gear was not fully extended. When it extended, and the asset rapidly moved to compensate for this, the pilot got squished.
Everytime I've encountered it myself, the graphical and sound occurences give me the feeling of a "player collided with asset" death. This has happened to me from a complete standstill on the runway a few times, and I don't have any joysticks installed or configured for MWLL.