All of the sudden I started getting:
Access to XMLHttpRequest at 'https://www.wix.com/_api/wix-laboratory-server/laboratory/conductAllInScope?scope=wix-form-builder' from origin 'https://www.mydoamin.com has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
And it's not limited to a specific site. I tested in 2 of my websites on different pages.
Are you experiencing it too?