Nav Mesh Won't Generate on ANY LEVEL

Nav Mesh doesn’t generate on ANY level, even in a new, blank level with only a static mesh plane and a single nav volume.

When I press “P” with the nav volume highlighted, no green vizualizer for the nav mesh appears. When I build paths, it finishes instantly, which makes me think the build didn’t find any surfaces to draw the nav mesh on.

This issue only happens in one project, nav mesh generation works fine in a blank project.

I wonder if something like custom collision channels I’ve created or generating mesh distance fields has messed with the nav mesh generation?