refactor: remove unnecessary else

packages/runtime-core/src/apiAsyncComponent.ts

@@ -158,10 +158,10 @@ export function defineAsyncComponent<
                   })
                 : null
           })
-      } else {
-        markAsyncBoundary(instance)
       }
 
+      markAsyncBoundary(instance)
+
       const loaded = ref(false)
       const error = ref()
       const delayed = ref(!!delay)