I can add some color to this topic, and hopefully its more helpful for the group to help assist in a resolution.
It’s important to note I am using keyboards for controls- why is another top for another day. However, out of an abundance of caution, I cleared the elevator and aileron controls then re-set them using arrow left/right, up/down appropriately. This did not clear the issue. There are no assignment confects.
When the autopilot is engaged and a rate of decent or climb set, the autopilot does not respond. It will kick in a few seconds later with severe parabolic actions. Also, when I click to increase or decrease rate of climb the button either turns but the value is not updated, or the value updates but the button is not responding. Furthermore, the heading select also is not reliable- value is set but the aircraft does not immediately respond. When it finally does, it will with extreme bank and continue to go in full 360 degrees past the assigned heading. Eventually once at cruse, things stabilize and I can use heading changes without issue.
I understand there is a mod out there, and I will download and install it. I think we should not lose sight of the issue. If this is a bug then Microsoft should fix it. Basic A/P functions should work- I don’t think that’s asking for a lot.