Can you check the AEM logs?

Can you share more details?

https://experienceleague.adobe.com/docs/experience-manager-65/assets/administer/config-smart-tagging.html?lang=en for integrating Smart tagging with AEM.

Check if you get something in the error.log when you move out of the source edit.AEM applies the principle of filtering (Cross-site scripting) all user-supplied content upon output.Refer: https://docs.mktossl.com/docs/experience-manager-65/developing/introduction/security.html?lang=en  

Check the AEM logs.

https://adobe-apiplatform.github.io/umapi-documentation/en/getstarted.html for details.

https://experienceleague.adobe.com/docs/experience-manager-guides-learn/videos/output-generation/troubleshooting-publishing-errors.html?lang=en for troubleshooting publishing errors.