🐛[BUG] CheckCard 'defaultValue' doesnt work in form

Reproduction here (click on submit):

https://codesandbox.io/p/sandbox/stupefied-tamas-7f5jyx

When using defaultValue on CheckCard.Group, the value is not set on the form

Start with the linked CodeSandbox reproduction and click Submit to observe how CheckCard.Group's defaultValue interacts with the form. Trace the CheckCard.Group form integration in the relevant component entry point. Done means the default value is included when the form is submitted, with the existing reproduction working as expected.

Written by the indexing model from the issue text.