Today Steve was working around the 1X5 rack to strain relief the cable jungles and the jungle is now getting less jungle.
During the work he disconnected and reconnected some cables.
So for a doublecheck I checked all the suspensions to see if the suspensions are still healthy or not.
Aha, then I found a mistake.
See the pictures below. It's a very subtle difference. This wrong connection prevented MC1 and MC3 from damping.