MotionVectors not working UE 5.4.2

Hi guys

Motion Vectors are not working for me. I have turned on motion blur in preferences. My post volume has motion blur on. My camera has motion blur on.

I have a simple cube rotating in the Sequencer.

Deferred Renderer has motion vector pass on. (additional post process materials is on and motion vector material is enabled)

In the default render (or beauty render) the cube is motion blurred (tells me that motion blur works). But when I (temporarily) visualize the motion vector channels in Fusion, the entire screen is just yellow. The motion vector channels have no vector information. (i am plugin the motionvector R and motionvector G channels in the the velocity channels x and y)

Is this a bug? Or do I miss anything?

Thank you
Andras

Same problem here, worked before in ue5.3, but doesn´t in 5.4 anymore.