Holes in Terrain after cullStaticData()

One of the things I have noticed in messing around with the Terrain features of Xith3D is holes in terrain after calling cullStaticData(). The holes appear regardless of the parameters passed to this method. I noticed it first in Xith3DTerrainTest and then in my own tests of the terrain system. The only way I can seem to get completely hole-less terrain is to simply not call this method and that is not an acceptible solution to my problem. Granted, these holes are relatively small, but a hole is still a hole. Has anyone determined the cause of these holes and, if so, a solution?