work

src/Scanner/StellaOps.Scanner.WebService/Options/SurfaceManifestStoreOptionsConfigurator.cs

@@ -32,9 +32,8 @@ public sealed class SurfaceManifestStoreOptionsConfigurator : IConfigureOptions<
 
         if (string.IsNullOrWhiteSpace(options.RootDirectory))
         {
-            options.RootDirectory = Path.Combine(
-                _cacheOptions.Value.ResolveRoot(),
-                "manifests");
+            var cacheRoot = _cacheOptions.Value.RootDirectory ?? Path.Combine(Path.GetTempPath(), "stellaops", "surface-cache");
+            options.RootDirectory = Path.Combine(cacheRoot, "manifests");
         }
     }
 }