Fixing Revit Topo Sub-Regions

Today, I ran into an issue with sub-regions in Revit topo surfaces and thought I’d share the quick fix with you.  Have you ever created subregions of a topo and at some point realized that you’ve in-advertantly created holes in the topo where you intended to create different material conditions. As shown in the image below, some grassy regions seemed to be displaced.

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I found that if I deleted the grassy region by simply selecting the objects below the main topo surface, that I had to re-create new sub regions as it simply returned the “hole anomaly” shown in white on the surface back into the default brown region of the topo.  But if I edited the surrounding sub-region and removed the internal sketchlines, the hole disappeared and my grassy region returned.