fix issue where invalidateRootCache didn't happen when the page first loaded

src/app/core/server-check/server-check.guard.ts

@@ -52,6 +52,10 @@ export class ServerCheckGuard implements CanActivateChild {
    * operation, the cached version is used.
    */
   listenForRouteChanges(): void {
+    // we'll always be too late for the first NavigationStart event with the router subscribe below,
+    // so this statement is for the very first route operation
+    this.rootDataService.invalidateRootCache();
+
     this.router.events.pipe(
       filter(event => event instanceof NavigationStart),
     ).subscribe(() => {