fix(transition): fix broken leave transition on dev root fragment (#5268)

packages/runtime-core/src/renderer.ts

@@ -2159,7 +2159,23 @@ function baseCreateRenderer(
   const remove: RemoveFn = vnode => {
     const { type, el, anchor, transition } = vnode
     if (type === Fragment) {
-      removeFragment(el!, anchor!)
+      if (
+        __DEV__ &&
+        vnode.patchFlag > 0 &&
+        vnode.patchFlag & PatchFlags.DEV_ROOT_FRAGMENT &&
+        transition &&
+        !transition.persisted
+      ) {
+        ;(vnode.children as VNode[]).forEach(child => {
+          if (child.type === Comment) {
+            hostRemove(child.el!)
+          } else {
+            remove(child)
+          }
+        })
+      } else {
+        removeFragment(el!, anchor!)
+      }
       return
     }