Surface display in Shaded mode is jagged?

I ran into a weird issue where my surfaces are all displayed with dashed outlines. The surfaces are next to each other, so there likely is Z-fighting involved.


The weird thing is that copying these surfaces to a new document (either v8 or another WIP instance) clears the issue. I tried ClearAllMeshes and change the Meshing settings, but I’m not sure how I can get my file back to working order without copying the entire thing over to a new file.
Here’s a small sample:
Dashed surface outlines.3dm (267.3 KB)