Atmospheric thruster does not work when returning from high altitude by autopilot.

Hello.

When the ship returns from space to the ground, if I start autopilot above an altitude of 9 km where the atmospheric thrusters begin to work, the ship loses control of the atmospheric thrusters (perhaps forever).

In creative mode, I built a ship that went from the ground to space, worked, and then returned to the ground.

The outline of the ship is as follows.

-Small grid ship.

-The ship has several atmospheric thrusters and hydrogen thrusters. The ship does not have an ion thruster because I cannot use the ion thruster in survival mode yet.

-When the ship returns from space to the ground, it descends in free fall and atmospheric thrusters. I don't use hydrogen thrusters because I'm going to use up hydrogen for space activities.

-When the ship returns from space to a base on the ground, I want to use autopilot.

The problem occurred with the autopilot for return. After I turned on the autopilot at an altitude of 30km, the atmospheric thruster did not work even at an altitude of 9km or less.

Apparently, when I start autopilot above the altitude of 9km where the atmospheric thrusters start working, the ship loses control of the atmospheric thrusters.

I have prepared save data that reproduces this phenomenon. Below is the link.

https://drive.google.com/file/d/1wbkdCvYlvr9vto0Yzdo6lWIbQP7GTOQp/view?usp=sharing

I also attached a log file to this message.

● Test section

--I have set up a test section near the base of a planet like Earth.

--The test area has an antenna, a battery, a tower for GPS coordinates, and a drone XTQ-6.

● Drone XTQ-6

--A simple atmospheric thruster type aircraft.

--It has two remote control blocks. -main is for main remote control. -rtb is for returning to the test section.

-Don't use this pre-existing drone for descent testing. Obtain a blueprint for this ship and use the ship spawned from that blueprint for descent testing.

● Reproducibility procedure

--First of all, get the blue print of the drone (XTQ-6).

-Spawn a test drone from the acquired blueprint.

--Get the GPS coordinates of any two points near the test section. You can use the tower I built as a guide.

--Register the above two points in the autopilot route of RC block-rtb of the test drone.

--Get the drone's blue print again.

--Go over 12km above the test section in spectator mode (F8). (I set it to 12km with a margin. In my environment, it can be reproduced even at 9.5km.)

--Spawn the drone using the blueprint in spectator mode.

--Immediately remotely control the drone and start autopilot for return from the toolbar.

--Watch the drone descent for a while.

--Probably, even if the drone is below 9km, the atmospheric thruster will not work and it will descend at 104m / s. When this happens, the drone will not stop whether you turn off the autopilot and remotely control it or turn the atmospheric thruster on and off.

● Remarks

--It doesn't always reproduce in my environment. It's just that it's often reproduced. If you can't reproduce, raise the altitude further. Or repeat the descent test with the same blueprint. Blueprints that have never undergone a descent test are likely to work well.

--The atmospheric thruster always works when descending from high altitude with autopilot off and inertia damper on. Also, the thruster always works when the autopilot is started below 9km.

Thank you in advance.