All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Closes #29359

How to test the changes in this Pull Request:

1. Go to woocommerce->settings->shipping and add a shipping zone with a shipping method.
2. After seeing the "Save Changes" button disables, try to navigate away from this page.
3. Ensure you're not seeing any save changes message pop up from the browser.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?

Changelog entry

Fix - Unneeded browser popup message of unsaved changes when adding a shipping zone with a shipping method.