It only happens on the ground: when I activate the autopilot, the trim starts vibrating and spins all the way to the maximum setting.

Video : https://drive.google.com/file/d/1EjTuKhl4lgUhRYjPjlkXrelh8NdwBSQY/view?usp=drive_link

Once in flight, everything works perfectly; when I engage the autopilot, there is no erratic trim behavior, and everything runs smoothly.

I should mention that I am using MSFS 2024, the Caravan (version 1.2), and VKB controllers. I tested disconnecting the controllers (leaving only the keyboard and mouse connected), but the problem persists.

Thank you in advance for your help.