As I commented in this thread - https://theme.co/apex/forum/t/the-preview-was-unresponsive-after-loading-issue-when-is-this-going-to-be-fixed/30862/5?u=thompson
I am still having issues and seeing multiple bugs regarding this update, so I am creating a topic based on the last answer I got and I am attaching a secure note to see if the issue is with the host environment, I might need to whitelist the IP addresses since this is running in a private environment.
Also the issue occurs multiple times so it comes and goes, I have deactivated plugins and followed the procedures that I’ve read in related threads through the support forum.