fix: preserve standalone overlay defaults for undefined overrides

src/data/localGeojson.js

@@ -35,11 +35,15 @@ export const localGeoJsonServices = Object.freeze({
 export function createLocalGeoJsonLayer(options) {
   return createLayer(options, {
     ...localGeoJsonServices,
-    overlayHost: options.overlayHost ?? localGeoJsonServices.overlayHost,
+    overlayHost: options.overlayHost === undefined
+      ? localGeoJsonServices.overlayHost : options.overlayHost,
   });
 }
 
 /** Create an overlay publisher using the standalone app's host by default. */
 export function createLocalInfrastructureOverlayPublisher(options) {
-  return createPublisher({ host: localGeoJsonServices.overlayHost, ...options });
+  return createPublisher({
+    ...options,
+    host: options.host === undefined ? localGeoJsonServices.overlayHost : options.host,
+  });
 }