When I create a form for using the instructions for Messenger Ads in https://www.facebook.com/business/help/2095643774069586 , I can mark e.g.: the email question as optional.

When I retrieve the form using "/", it does not include the "is_optional" field.

When I created the form, I saw in Web Developer Tools that it passed in the following data for the questions:

[{"key": "email", "type": "EMAIL", "is_optional": true}, {"key":"full_name", "type":"FULL_NAME", "is_optional": false}]

When I retried the question data, I see:

[{"id":"REDACTED","key":"email","label":"Email","type":"EMAIL"},{"id":"REDACTED","key":"full_name","label":"Full name","type":"FULL_NAME"}]

I've tried this with API versions v19.0 and v20.0, and I got the same result.

Why isn't is_optional returned in the form data?