chore: minor tweaks

Author: edison1105

packages/runtime-core/src/renderer.ts

@@ -1226,7 +1226,7 @@ function baseCreateRenderer(
       if (!initialVNode.el) {
         const placeholder = (instance.subTree = createVNode(Comment))
         processCommentNode(null, placeholder, container!, anchor)
-        initialVNode.placeholderEl = placeholder.el
+        initialVNode.placeholder = placeholder.el
       }
     } else {
       setupRenderEffect(
@@ -1983,7 +1983,8 @@ function baseCreateRenderer(
         const anchorVNode = c2[nextIndex + 1] as VNode
         const anchor =
           nextIndex + 1 < l2
-            ? anchorVNode.el || anchorVNode.placeholderEl
+            ? // #13559, fallback to el placeholder for unresolved async component
+              anchorVNode.el || anchorVNode.placeholder
             : parentAnchor
         if (newIndexToOldIndexMap[i] === 0) {
           // mount new

packages/runtime-core/src/vnode.ts

@@ -196,6 +196,7 @@ export interface VNode<
 
   // DOM
   el: HostNode | null
+  placeholder: HostNode | null // async component el placeholder
   anchor: HostNode | null // fragment anchor
   target: HostElement | null // teleport target
   targetStart: HostNode | null // teleport target start anchor
@@ -217,11 +218,6 @@ export interface VNode<
    */
   ssFallback: VNode | null
 
-  /**
-   * @internal
-   */
-  placeholderEl: HostNode | null
-
   // optimization only
   shapeFlag: number
   patchFlag: number
@@ -716,7 +712,7 @@ export function cloneVNode<T, U>(
     suspense: vnode.suspense,
     ssContent: vnode.ssContent && cloneVNode(vnode.ssContent),
     ssFallback: vnode.ssFallback && cloneVNode(vnode.ssFallback),
-    placeholderEl: vnode.placeholderEl,
+    placeholder: vnode.placeholder,
 
     el: vnode.el,
     anchor: vnode.anchor,