SimConnect AICreateEnrouteATCAircraft wrong spawn altitude

Using the SimConnect method “AICreateEnrouteATCAircraft” to spawn an airplane
enroute causes the AI to spawn at the altitude provided in the [reference
speeds]-Section of the SimObject and not on the altitude provided in the PLN
file. → This issue is new since SU6!

addition info: Updated the flight_model to this: [REFERENCE SPEEDS]
flaps_up_stall_speed=142.0 ; Knots True (KTAS) full_flaps_stall_speed=113.0 ;
Knots True (KTAS) cruise_speed=460 max_mach=0.785 max_indicated_speed=340 ;
Red line (KIAS) max_flaps_extended=274.030126 ; normal_operating_speed=360 ;
airspeed_indicator_max=562.5 ; rotation_speed_min=140 climb_speed=231 ; Climb
speed (Kts) cruise_alt=36000 ; (ft) takeoff_speed=145
spawn_altitude=15000 spawn_cruise_altitude=38000
-— Aircraft still spawn at low altitude.
Airplanes with PLN files containing more then two waypoints (departure and
destination) are climbing to their CRZ FL, all other fly at maximum 2000

Update on this: SimConnect AI spawn altitude is related to user altitude.
Sitting on Ground will spawn Ai always around +2000ft, when enroute you get AI
at ±/2000ft of user altitude.