We have no issues with New Forms in SharePoint Online. Presumably this means the Microsoft update hasn't been provisioned on our tenant yet? I obviously recognise the need for a fix, but I am slightly concerned that any fix might mean that new forms stop working for us, since we currently have no problem.
It seems like the issue was resolved on Microsoft's side before we rolled out our fix. You might have to clear the browser's cache for the changes to take effect.