You built the surface. You built the profile. You styled the labels. You even tested it. Plotted from model space? Fine. Plotted from a layout viewport in the base file? Also fine. Same template. Same CTB. Same PC3. Same Civil 3D styles. Then you xref that base file into a sheet and suddenly your plan set looks like it’s been redacted by a federal agency. White/colored boxes. Opaque masks. Geometry disappearing behind rectangles. So what changed? Not the template. Not the CTB