diff --git a/packages/compiler-core/src/transforms/transformElement.ts b/packages/compiler-core/src/transforms/transformElement.ts
index 905268dee31..fe0a5afb7b9 100644
--- a/packages/compiler-core/src/transforms/transformElement.ts
+++ b/packages/compiler-core/src/transforms/transformElement.ts
@@ -134,6 +134,11 @@ export const transformElement: NodeTransform = (node, context) => {
         if (hasDynamicSlots) {
           patchFlag |= PatchFlags.DYNAMIC_SLOTS
         }
+
+        // sub-component‘s direct child should openBlock
+        for (let i = 0; i < node.children.length; i++) {
+          node.children[i].codegenNode!.isBlock = true
+        }
       } else if (node.children.length === 1) {
         const child = node.children[0]
         const type = child.type
diff --git a/packages/runtime-core/src/helpers/renderSlot.ts b/packages/runtime-core/src/helpers/renderSlot.ts
index a6c2d47e7aa..eb16bc02200 100644
--- a/packages/runtime-core/src/helpers/renderSlot.ts
+++ b/packages/runtime-core/src/helpers/renderSlot.ts
@@ -35,7 +35,7 @@ export function renderSlot(
       Fragment,
       { key: props.key },
       slot ? slot(props) : fallback || [],
-      slots._ ? PatchFlags.STABLE_FRAGMENT : PatchFlags.BAIL
+      slots._ ? 0 : PatchFlags.BAIL
     )
   )
 }