V-text-field autocomplete value doesn't set v-model value

Although my "autocomplete" (Browser Credentials / Saved Username and Password) value appears in the v-text-field when our page is first loaded, it is not equal to my v-model value.

For this reason, validations rules return an error and therefore button is disabled.

Then, when I press anywhere or any key, the value fills up and my button becomes enabled.

And here my code:

               <v-text-field
                id="signEmail"
                v-show="!signInPasswordForm"
                class="font-size-base"
                v-model="signInFormProps.signInEmail"
                name="email"
                ref="email"
                type="email"
                :rules="specialEmailRules"
                solo
                flat
                tabindex="1"
              ></v-text-field>

What is causing this situation?