This was covered in the Xtreme Forum when Xara Xtreme 4.0 was released.
If you rotate the Extruded shape to a point where the face is no longer shown. Use the dropdown list in the Infobar to select Angle 1 and then use the slider to rotate the shape.
Not a bug but a design necessity due to how Extrusions are displayed in a 2D environment.
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