Issue

When setting packaging on a product variant and clicking the "Packaging Prices" button, Odoo does not automatically populate the default packaging.

Steps to Reproduce

1. Install the following modules:
   • stock
   • product_packaging_unit_price_calculator
2. Assign the "Manage Product Packaging" access rights to your user.
3. Go to Inventory > Products > Product Variants.
4. Add two packaging options to a product variant.
5. Click the "Packaging Prices" button.

Before:

After: