Reproduction link

Steps to reproduce

Steps to reproduce:

1. Create new React 19 project with Antd 5.23
2. Add @ant-design/v5-patch-for-react-19 and import it
3. Render Dropdown with custom component as child
4. Observe dropdown either misplaced or flashing
5. Wrap custom component in forwardRef to verify fix

Note: Complete reproduction in attached sandbox

What is expected?

• Dropdown correctly positions and persists when using custom component children, without needing forwardRef

What is actually happening?

• Dropdown renders at wrong screen position
• Dropdown flashes/disappears immediately
• Must use forwardRef as a workaround