You can refer to the AEM WKND SPA Project created using React. It contains the setup information:Adobe Experience Manager Help | Getting Started with React and AEM SPA Editor - Chapter 0 https://helpx.adobe.com/experience-manager/kt/sites/using/getting-started-spa-wknd-tutorial-develop/react.htmlAdo...

You can try babel.The following article may be helpful:https://blog.dniccumdesign.com/adding-babel-support-to-an-aem-instance/

In order to properly align with the new model:Replace the references to the old model (/etc/tags) with the new one (/content/cq:tags) by using the tagID.Log in to CRXDE LiteMove the tags from /etc/tags to /content/cq:tagsRestart the OSGi Component com.day.cq.tagging.impl.JcrTagManagerFactoryImplAdob...

This issue should not happen if you have performed these steps correctly.Make sure you don't have any tags at location etc/tags after you move the tags. Also, confirm if tags are loaded here -> Go to http://localhost:4502/aem/tags

The following documents could be helpful:Cloud Service Configurations com.day.cq.wcm.webservicesupport ("The Adobe AEM Quickstart and Web Application.")

I had done it. It worked for me.Please follow the instructions here:Performing an In-Place Upgrade

Thank you for sharing the steps. I was able to reproduce the issue.Please log a daycare ticket.

You can use Workflow Steps as follows:Workflow Step Reference

You can set the session using localStorage and thus, it can be accessed by any app within your browser, until you or the logout operation clears the session.

I got confused with the previous update.Could you please share the steps in detail to reproduce the issue?