Steps to reproduce the issue

To reproduce the problem you have to edit a menu item, when modifying the main menu it performs an ajax correctly to modify options in the parent item. The problem is that it doesn't update via choices.

In form administrator\components\com_menus\forms\item.xml:
<field name="parent_id" type="MenuParent" label="COM_MENUS_ITEM_FIELD_PARENT_LABEL" layout="joomla.form.field.list-fancy-select" default="1" filter="int" clientid="0" > <option value="1">JGLOBAL_ROOT_PARENT</option> </field>

You have to modify the file media\com_menus\js\admin-item-edit.js

Expected result

Return the corresponding menu items.

Actual result

The selector does not update the options in Choices.

System information (as much as possible)

PHP Version 8.1.2
Joomla 4.2.2

Additional comments

I need to update selectors with Choices and haven't found any examples. With Chosen it was quite simple.

I have tried:

activeXHR = Joomla.request({ url, onSuccess: response => { activeXHR = null; const items = response ? JSON.parse(response) : [];
const ele = new Choices(document.getElementById('element')); if (items.length) { ele.setChoices(items, 'value', 'text', false); } }, onError: () => { activeXHR = null; } });

But it doesn't work for me and I don't think I have to re-instantiate it with: new Choices()

The instance is already created in file media\system\js\fields\joomla-field-fancy-select.js, so I don't know how to get an instance of a selector already created.

Can you help me please, thank you.