Enatega Admin Dashboard: Subcategories Disappear When Updating a Product

Describe the bug
When a user clicks on any product to update its details, the associated subcategories do not load or display in the update form. As a result, the subcategory field appears empty or missing, preventing the user from knowing or modifying the existing selection.

Steps to Reproduce:

Go to the product list page.

Click Edit on any existing product.

Observe the subcategory field.

Expected Result:
The subcategory field should display the current subcategories assigned to the product.

Actual Result:
The subcategory field is blank, and previously assigned subcategories are not shown.

Desktop (please complete the following information):

OS: [e.g. Windows]
Browser [e.g. chrome]
Version [e.g. Latest]

Labels: Enatega Multivendor Admin Dashboard, High Priority, Bug

Start at the Enatega Admin Dashboard product list and the product update form, then trace how the existing product's subcategories are loaded and bound to the subcategory field. Reproduce the issue by editing a product with assigned subcategories; done means those current subcategories are visible and remain modifiable in the update form.

Written by the indexing model from the issue text.