Update - Not is a bug - Can be done:
#. Spawn on the ground, hot, with very little fuel
#. Apply wheel chocks
#. Use afterburner until all fuel is depleted
#. Both throttles to OFF
#. Keep Battery Switch ON and R Gen / L Gento ON
#. Refuel using ground crew
#. Request ground crew to connect ground power
#. Request ground crew to connect ground air
#. Request ground crew to apply ground air
#. Move "External Power Switch" to "Reset" position. Then, it automatically returns to normal - Wait 5 to 10 seconds in normal position, so move to OFF.
#. Engine crank sw to right
#. Observe right engine rpm increasing
#. At 20%, move right throttle to IDLE
#. Engine right start :)
#. APU now can be started to crank left engine :)