Just wanted to say after digging the real problem is the “.MapName” at the end. Full paths work as long as the path doesn’t have that.
“MapName” works. “Content/Maps/MapName” works. “Content/Maps/MapName.MapName” loads but has collision and other issues.
I have a project with many sample maps from third parties, so just the short name alone doesn’t work for me and I needed the full path.