[Checkout] Billing address overwrites shipping address when copy address flag is set

[sync-by-unito]

Expected result

Customer should be able to copy billing address from shipping section and modify it without overwriting shipping address.

Actual result

Modifying copied billing address overwrites shipping address as well.

Steps to reproduce

1. Go to category page, e.g. Gear
2. Add product to cart
3. Open cart sidebar and proceed to checkout
4. Insert first and lastname, email, and proceed to shipping section
5. Fill and submit shipping form
6. Select shipping method and proceed to billing section
7. Check "Copy address data from shipping" and leave it checked
8. Modify billing address
9. Proceed through rest of the checkout and place an order
10. Check shipping and billing addresses on the admin panel for created order

[sync-by-unito]

➤ Kevin Gorjan commented:

Solution: Maybe disable the input fields when you clicked the checkbox?