Fix auto preload <img> issue for renderToString

packages/react-dom-bindings/src/server/ReactFizzConfigDOMLegacy.js

@@ -325,5 +325,9 @@ export function writePreambleStart(
   );
 }
 
+export function preloadInstance(resource, instance) {
+  return;
+}
+
 export type TransitionStatus = FormStatus;
 export const NotPendingTransition: TransitionStatus = NotPending;

packages/react-server/src/ReactFizzServer.js

@@ -6247,7 +6247,7 @@ export function startFlowing(request: Request, destination: Destination): void {
   request.destination = destination;
 
   try {
-    flushCompletedQueues(request, destination);
+      flushCompletedQueues(request, destination);
   } catch (error) {
     const errorInfo: ThrownInfo = {};
     logRecoverableError(request, error, errorInfo, null);