fix(hydration): fix update before async component is hydrated (#3563)

fix #3560

packages/runtime-core/src/hydration.ts

@@ -8,7 +8,7 @@ import {
   VNodeHook
 } from './vnode'
 import { flushPostFlushCbs } from './scheduler'
-import { ComponentOptions, ComponentInternalInstance } from './component'
+import { ComponentInternalInstance } from './component'
 import { invokeDirectiveHook } from './directives'
 import { warn } from './warning'
 import { PatchFlags, ShapeFlags, isReservedProp, isOn } from '@vue/shared'
@@ -178,24 +178,15 @@ export function createHydrationFunctions(
           // on its sub-tree.
           vnode.slotScopeIds = slotScopeIds
           const container = parentNode(node)!
-          const hydrateComponent = () => {
-            mountComponent(
-              vnode,
-              container,
-              null,
-              parentComponent,
-              parentSuspense,
-              isSVGContainer(container),
-              optimized
-            )
-          }
-          // async component
-          const loadAsync = (vnode.type as ComponentOptions).__asyncLoader
-          if (loadAsync) {
-            loadAsync().then(hydrateComponent)
-          } else {
-            hydrateComponent()
-          }
+          mountComponent(
+            vnode,
+            container,
+            null,
+            parentComponent,
+            parentSuspense,
+            isSVGContainer(container),
+            optimized
+          )
           // component may be async, so in the case of fragments we cannot rely
           // on component's rendered output to determine the end of the fragment
           // instead, we do a lookahead to find the end anchor node.