The Mouse Y axis does not work when assigning LookUp key bind in the project setting. If assigned the mouse will look left/right while moving the mouse and down.
Actual Result: Mouse Y axis assigned to LookUp does not work
Expected Result: User can look up in Pie when the Mouse Y axis is assigned to LookUp
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-149775 in the post.