--map at autotest.py not working and producing ERROR: no attribute 'ElevationModel'

When I start an autotest, e.g.
./Tools/autotest/autotest.py --no-clean --map --speedup=10 test.Plane.TerrainMission
I can see no map and receive an Error: ERROR in command [‘load’, ‘map’]: ‘NoneType’ object has no attribute ‘ElevationModel’

Loaded defaults from /home/willy/ardupilot/Tools/autotest/default_params/plane-jsbsim.parm
AT-0003.3: AP: Ground start
AT-0003.3: AP: Skipping INS calibration
AT-0003.3: AP: Calibrating barometer
AT-0003.4: Starting MAVProxy
PYTHONPATH: /home/willy/ardupilot/Tools/mavproxy_modules
Running: "mavproxy.py" "--master" "tcp:" "--aircraft" "test.ArduPlane" "--sitl=" "--streamrate=10" "--target-system=1" "--target-component=1" "--map" "--default-modules" "misc,wp,rally,fence,param,arm,mode,rc,cmdlong,output"
Connect tcp: source_system=255
ERROR in command ['load', 'map']: 'NoneType' object has no attribute 'ElevationModel'
no script test.ArduPlane/mavinit.scr
Log Directory: test.ArduPlane/logs/2022-10-25/flight1
Telemetry log: test.ArduPlane/logs/2022-10-25/flight1/flight.tlog
AT-0010.4: LOGFILE test.ArduPlane/logs/2022-10-25/flight1/flight.tlog
AT-0010.4: buildlog=/home/willy/buildlogs/ArduPlane-test.tlog
AT-0010.4: AP: Barometer 1 calibration complete
AT-0010.4: AP: Barometer 2 calibration complete
AT-0010.4: AP: Airspeed 1 calibration started
AT-0010.4: AP: ArduPilot Ready

That’s happening after a rebase to master bb1b2dafaec92716edc8a45ac2dca82d19c7b920

When I use e.g.
../Tools/autotest/sim_vehicle.py --no-rebuild -L MSGH --console --map --speedup=2
all is working like it should…

So what is the difference I have to look for?

On the way of findind the rootcause of that problem
I updated to MAVProxy Version: 1.8.59
installed again all necessary dependencies
checked the $PATH.

In the meantime I found out, that
$> mavproxy.py --map
is starting the map correctly