Hello @jvalks
This option doesn’t create robots.txt file, but it should update it after re-saving the Settings. We will check this issue and will give you a feedback very soon.
Best regards
Seems you don’t need a create robots.txt file, if you have created, please delete that file. WordPress will generate robots.txt file content dynamically when someone visits your robots link – https://yourdomain.com/robots.txt. And Sitemap URL also will be added dynamically here.
If robots URL is not opening without created file, please check your server configurations or add the Sitemap URL manually to created file. Here is an example of WordPress robots.txt file:
User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php
Sitemap: https://example.com/sitemap.xml
Best regards