v1.2.6: How to fix error not validate required radio button field?

QUESTION:

The module doesn't validate the required field (radio button type) on my checkout page and guests can checkout without filling this field.

The error also happens on your demo site, please have a look: https://www.loom.com/share/a20fd16add004d91ad9d9ba1f78bb39d

Note that we use the latest version - v1.2.6 and M2.4.2.
Please give us a guide to fix it.

ANSWER:

To fix this error, please edit the file app/code/Bss/CheckoutCustomField/view/frontend/web/js/model/checkout-custom-field-validator.js as below:

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