There is a hard-coded replacement in DiffusionImaging for several types of planar figures regarding the 3D mapper. This leads to errornous behavior and rendering of these planar figures types if the DiffusionImaging module is built. Additionally, the DiffusionImaging planar figure 3d mapper is quite rudimentary, incomplete and contains several bugs.
Solution: Remove the hard-coded mapper replacement and the DiffusionImaging planar figure mapper itself. Set the "planarfigure.3drendering" property to true if needed.