Merge pull request #21476 from storybookjs/fix-docs-blank-canvases

Docs: Cleanup with Promise instead of setTimeout

code/ui/blocks/src/components/Story.tsx

@@ -60,7 +60,7 @@ const InlineStory: FunctionComponent<InlineStoryProps> = (props) => {
     return () => {
       // It seems like you are supposed to unmount components outside of `useEffect`:
       //   https://github.com/facebook/react/issues/25675#issuecomment-1363957941
-      setTimeout(() => cleanup(), 0);
+      Promise.resolve().then(() => cleanup());
     };
   }, [autoplay, renderStoryToElement, story]);