diajohn wrote on Jan 30^th, 2018 at 3:33am:

Today I flew a flight and tried a landing with Autothrottle on and SPD set, thrust levers on idle, and AP off.  On touchdown the thrust did not go to idle.  And by the way, why is there no touchdown sound?  Needless to say the landing was a mess. Does the thrust idle only if AP is on?

This happened to me today as well.
It would have been nice if the autothrottle did not register movements on my throttle levers when engaged.