grouping do not work

[emonfejm]

Please respect maintainers time by filling in these sections. Your issue will likely be closed without this information.

• Vue Version:
  Vue3

Describe the bug
Only top dimension option is shown instead:
I can see only first labels Fruits and Vegetables

const options = ref([
  {
    label: 'Fruits', // Category label
    options: [
      { label: 'Apple', value: 1 },
      { label: 'Banana', value: 2 },
      { label: 'Orange', value: 3 },
    ],
  },
  {
    label: 'Vegetables', // Another category
    options: [
      { label: 'Carrot', value: 4 },
      { label: 'Spinach', value: 5 },
      { label: 'Broccoli', value: 6 },
    ],
  },
])

Reproduction Link

Steps To Reproduce

Expected behavior
grouping options shown in the list

Screenshots