[Bug] Don't see input changed on sub-property v-model

[vincenzobologna]

Vue2-datepicker version: 3.11.1
Vue version: 2.7.14
Browser: Chrome 121.0.6167.184

Steps to reproduce

input text remain blank (or with older value of form data) if date field is on sub-property of form. For example date works if i have a filed like:
form.date

but it doesn't works if is on:
form.subfield.date

In Vue debug console i see the form field is correcly compiled, but i can't see on browser input date filled.

Reproduction Link or Source Code

Working Code:
<vue-date-picker v-model="form.date" value-type="YYYY-MM-DD" format="YYYY-MM-DD" input-class="px-2 py-1 outline-none" popup-class="" />

Not working code:
<vue-date-picker v-model="form.subfield.date" value-type="YYYY-MM-DD" format="YYYY-MM-DD" input-class="px-2 py-1 outline-none" popup-class="" />

I already tried to force update with change event, but unsuccessfully.

Expected behavior

Date field input field filled with new selected date.

Actual behavior

Date input field doen't populate with new selected date.