Low acceleration changes causes the object's velocity to nearly zero out. The range this seems to occur at for the Acceleration change is between the values of zero and approximately thirty.
Repro Rate: 4/4
Tested this in //UE4/Release-4.27 @ CL#18319896 and the issue did not occur there, it is a regression!
Results: Object stutters in place with velocity getting set to nearly zero.
Expected: Object retains it's velocity in addition to the change in velocity due to the acceleration.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-149771 in the post.