Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes.
Provide extra information to complete the original description of the issue:
I believe this is the same issue I have described here: ATR decelerates as if it were in flight idle when it isn't
In the video below, pay attention to the engine torque and airspeed trend indicator as I go in and out of the flight idle detent. In a real turboprop, torque and propeller drag both depend on blade pitch, and are inversely related. This means you can’t have a large change in drag without a large change in torque.
And yet, that’s what’s happening here. Going into the flight idle detent magically causes the propellers to generate a massive amount of extra drag even though the torque changes by less than 1%. This is physically impossible for reasons described above.
It seems that the plane only looks at the cockpit thrust levers and applies a lot of extra drag to simulate prop drag whenever the levers are in the flight idle detent. However, the cockpit throttle levers don’t match what the engines or the user’s physical throttle levers are doing, as described here: ATR - The in game throttle position does not match the real hardware throttle in flight when in the FL Stage which causes this weird behavior of the plane decelerating like it’s in flight idle even though the engines are still producing ~30% torque.
If relevant, provide additional screenshots/video: