From fb3c3055064384e36c749033f9d2afd73f7a5a4a Mon Sep 17 00:00:00 2001
From: xiaodemen <fuq_pr@163.com>
Date: Mon, 19 Dec 2022 17:06:28 +0800
Subject: [PATCH] fix(patch): clone insert hooks to avoid being mutated during
 iteration

---
 src/core/vdom/patch.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/core/vdom/patch.ts b/src/core/vdom/patch.ts
index d0594863e3b..173840787bc 100644
--- a/src/core/vdom/patch.ts
+++ b/src/core/vdom/patch.ts
@@ -878,8 +878,11 @@ export function createPatchFunction(backend) {
               const insert = ancestor.data.hook.insert
               if (insert.merged) {
                 // start at index 1 to avoid re-invoking component mounted hook
-                for (let i = 1; i < insert.fns.length; i++) {
-                  insert.fns[i]()
+                // clone insert hooks to avoid being mutated during iteration.
+                // e.g. for customed directives under transition group.
+                const cloned = insert.fns.slice(1)
+                for (let i = 0; i < cloned.length; i++) {
+                  cloned[i]()
                 }
               }
             } else {