I have encountered a critical problem with Page Builder on Magento 2.4.8-p1. Saving changes often fail on the second attempt due to CORS errors. Specifically, we see:
- Access to XMLHttpRequest at ” from origin ‘null’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
- VM62:1 Uncaught SyntaxError: Unexpected end of JSON input
at JSON.parse () - [ERROR] Page Builder was rendering for 5 seconds without releasing locks.