UE4.16 (preview 3): UMG- unable to set spinbox delta value

We have the same issues on our UE4 project since updating from UE4.15.3 to 4.16.1 However the delta actually is taken into account e.g. when setting a spinbox to min 0, max 300 range and using a delta of 50 the spinbox slider will jump from 0 to 50 to 100 to 150… but the value by the mouse input is not incrementing according to the delta stepping. Dunno which value is actually returned when releasing the mouse/slider.