From 68365b9b2bc2ccef93e88475c4f15e7cfb4f2497 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 15 Jul 2021 18:51:59 -0400
Subject: [PATCH] fix(runtime-core): enter optimized mode for component as root

fix #3943
---
 packages/runtime-core/src/renderer.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index 67c81aa4e16..545b5561c7c 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -487,7 +487,7 @@ function baseCreateRenderer(
     parentSuspense = null,
     isSVG = false,
     slotScopeIds = null,
-    optimized = false
+    optimized = __DEV__ && isHmrUpdating ? false : !!n2.dynamicChildren
   ) => {
     // patching & not same type, unmount old tree
     if (n1 && !isSameVNodeType(n1, n2)) {
@@ -772,7 +772,7 @@ function baseCreateRenderer(
           parentSuspense,
           isSVG && type !== 'foreignObject',
           slotScopeIds,
-          optimized || !!vnode.dynamicChildren
+          optimized
         )
       }