Describe the bug
Custom value not persisted on blur when using value-primitive

To Reproduce
Steps to reproduce the behavior:

If possible, share a runnable snippet on StackBlitz by following the steps below:

1. Find an example in[ the documentation that looks similar to your case](https://stackblitz.com/edit/6kttks-xjfsfu?file=src%2Fmain.vue).
2. focus the Combobox
3. type some custom texts and click away to blur it
4. Current: the custom typed text is cleared

Expected behavior
The custom typed value persists