From 5bbfba6ea1e78e83f3ce5323717006cdd9860413 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 9 Nov 2023 16:22:22 +0800
Subject: [PATCH] Update BaseTransition.ts

---
 packages/runtime-core/src/components/BaseTransition.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/components/BaseTransition.ts b/packages/runtime-core/src/components/BaseTransition.ts
index 5914665bb98..8711d7271c2 100644
--- a/packages/runtime-core/src/components/BaseTransition.ts
+++ b/packages/runtime-core/src/components/BaseTransition.ts
@@ -473,8 +473,9 @@ function emptyPlaceholder(vnode: VNode): VNode | undefined {
 
 function getKeepAliveChild(vnode: VNode): VNode | undefined {
   return isKeepAlive(vnode)
-    ? // #7121 avoid the result is expired during HMR
-      vnode.component
+    ? // #7121 ensure get the child component subtree in case
+      // it's been replaced during HMR
+      __DEV__ && vnode.component
       ? vnode.component.subTree
       : vnode.children
       ? ((vnode.children as VNodeArrayChildren)[0] as VNode)