When webform is submitted programmatically it sends mail twice instead of single mail

Problem/Motivation

Programmatically submission of webform - sends mail twice instead of single

Steps to reproduce

1. Create webform handler where in submitForm() add some custom development and send mail through it for successfully custom development

2. Attach above handler to any webform

3. Programmaticlly submit that webform using WebformSubmissionForm::validateFormValues() and WebformSubmissionForm::submitFormValues().

: New Submission on How to programmatically create and update a submission →



It sends mail first mail via successful when no error comes, and second mail via function

How to avoid sending mail twice?