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 just did a short test flight to verify it, and can confirm that there is an issue with the prop speed. At first I tested the exact value where the lever axis would be put to fight idle by monitoring the prop angle in SPAD.neXt while at parking position (it would be constant down to that value and decrease when going below). Then I changed my thrust lever scaling to that value, so that I could not go below flight idle. After takeoff I got to cruising speed and then slowly reduced my thrust lever. At just slightly before reaching flight idle everything was still good, I had nearly 1900rpm. But at exactly flight idle, the prop would spin up to above 2500rpm. I verified also by moving the lever with the mouse down to the detent, and got the same result. Further testing showed that the prop speed is depending of actual air speed, as I got slower, the prop would also spin slower, until at about 75kn it would reach 1900rpm again.
If relevant, provide additional screenshots/video:
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