preserveState, combobox still loses selection

[EmilMoe]

I have 2 Headless UI comboboxes, the second depends on selection from the first (a sub-list).

To filter the second, with Inertia, I post the selection of the first with preserveState: true and filter backend in Laravel.

The problem is the Combobox loses it selection state, although the object holding it's value (it's v-model) persist the selected value and the display text is correct, the UI cannot show which option was selected in the list.

I have been trying to figure out what is going wrong, unfortunately without luck. My guess is that some property is not preserved?