Alexander Schleicher AS 33 Me 18m sailplane

 I cannot extend the engine.  I have main power on and engine power on, throttle off.

Extend toggle responds and indicates engine extended - but it has not.
However, if AI piloting is turned on, the engine extends, starts and the AS33 flys.
If I turn AI off, the engine stops and retracts, and AS33 glides normally.
I’m running MSFS 2020 updated to current July 13, 2022.
Perhaps there’s a note somewhere in the manual that would solve this
but I do not see it.

 Any suggestions?

Been loving flying this glider. It looks amazing and the model is excellent. Are there any keyboard shortcuts for the tablet in the middle?