UE5.1.1 Nanite WPO shadows not moving with the tree

Hi, looking to find out why when a tree has nanite enabled why the shadows stop moving. I cant seem to find a limitation on raytraced shadows and WPO when using nanite.

Is this a new limitation or have I been looking in the wrong place for documentation maybe? Can’t seem to get it to work at all.

The WPO is being driven by PivotPainter2.0 & simple grass wind. Nanite mesh is being animated correctly it is just the shadows that stop working and are static only.