Dropdown boundary is not taken into account

here is the reproduction :
https://stackblitz.com/edit/vitejs-vite-vrljbw?file=src%2Fmain.js,src%2FApp.vue&terminal=dev

As you can see using containerRef and pass it to the boundary isn't taken into account.

If i'm wrapping the input with the dropdown it work but for my real component i can't do that