[Combobox]Custom value not persisted on blur when using value-primitive

[zdravkov]

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

Workaround use the Combobox without the value-primitive - https://stackblitz.com/edit/6kttks-zrsydp?file=src%2Fmain.vue

[kdikov82]

Another workaround would be to add a new item to the data and get the custom text from the input element:
https://stackblitz.com/edit/w6wzb5-xo68mc?file=src%2Fmain.vue