Proposed Terrain on a widen & resurface corridor

I am trying to create a proposed terrain on the finished surface of a corridor using a mill/resurface & widening template.

When I go thru the steps using the Create Terrain using Graphical Filter, the proposed terrain voids on the widening part of the model. It tries to include it on one end. 

Does anyone have any suggestion on what I could look for to fix this?

  

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