Hi –
I am running into this issue as well, and noticed that the plugin is trying to make requests to my Site Address (x.com), as opposed to my WordPress Address (wp.x.com). My Site Address is where the site is actually located, but that is different from where WordPress is located for my instance.
As such, the POST request to save a snippet isn’t hitting a WordPress URL, and in my case my website throws a CORS error, since the plugin is trying to hit a different domain.
Access to fetch at 'https://x.com/blog/wp-json/wp/v2/users/me?context=edit&_locale=user' from origin 'https://wp.x.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.