There is an issue in the tax module where the option "Apply the discount only when one of the above carriers is selected by the customer" does not remain checked in the UI, even though it is correctly set via API.

1. Navigate to the tax module in the admin.
2. Attempt to check the option "Apply the discount only when one of the above carriers is selected by the customer."
3. Save the changes and observe that the checkbox does not remain selected.
4. Verify via the API that the option is correctly marked as true.

The issue is purely visual. The checkbox state is correctly reflected via the API, and the discount is applied as expected during checkout. Therefore, no workaround is necessary, as the functionality is not impaired.