Ju88 goes backwards on startup

[F/JG300_Gruber]

Brand new to me during tonight's event :

 

Spawning on the flat surface of Taman airfield (Kuban map) I launch the engines starting sequence. After 2 seconds all navigation and landing lights comes on spontaneously, and the plane starts to roll backwards, with both engines not yet running.

Like if I hitted the reverse thrust on a 737. Plus both brakes were inoperant. Not sure if it can be reproduced at all, but that one was kind of magic.