Does the same issue appeared if you disabled the plugin? If it does, then the issue is specifically caused by the plugin and for your information, Blog Posts plugin is a third-party plugin which is not developed by Atlassian therefore our knowledge on this plugin would be limited. I'd suggest you to directly contact the author of the plugin to get further assistance on the issue at:
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
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