Issue #3495607:Update preprocessing of checkboxes.

[Dhruvrepo]

Checklist before requesting a review

• I have formatted the subject to include ticket number as Issue #123456 by drupal_org_username: Issue title
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and they passed
• I have provided screenshots, where applicable

Changed

Screenshots