MultiSelect: Select all checkbox not working correctly in unstyled mode with Tailwind

Describe the bug

When using MultiSelect in unstyled mode with Tailwind CSS passThrough styling, the “Select All” checkbox does not work properly - clicking it has no effect.

The issue appears to be related to the appearance-none property. When disabled it starts to work but then I'm getting default browser checkbox. However there is no problem with other checkboxes (items in MultiSelect).

Reproducer

No response

System Information

- PrimeReact version: 10.9.6
- React version: 19.1.0
- Tailwind CSS version: 4.1.11
- Browser: Chrome 138.0.7204.169 (but same issue appears on Safari and Firefox)

Steps to reproduce the behavior

1.	Use MultiSelect with unstyled prop set to true.
2.	Add globally `.appearance-none { appearance: none;}` to hide default checkboxes look.
3.	Open the dropdown and try clicking “Select All” checkbox — it does not work.

Expected behavior

Checkbox is selecting/unselecting all options.

Start by reproducing the MultiSelect behavior with unstyled mode, Tailwind CSS passThrough styling, and the global appearance-none rule described in the issue. Compare the Select All checkbox with the working item checkboxes; done means clicking Select All consistently selects and unselects every option without restoring the browser-default checkbox appearance.