You need to have a Dispatcher Instance setup ,dispatcher flush agent set up in author instance which invalidates the cached page /asset once the page/asset has been activated.Sometimes even after dispatcher cache clear, old content will be rendered due to browser cache.If issue persists ensure that the browser cache is removed or try in incognito window for proper testing.Refer the below doc for reference.https://docs.adobe.com/docs/en/cq/5-6/deploying/dispatcher/page_invalidate.html#Invalidatin...

In the above mentioned query you are getting the node of type cq:PageContent , which means the result path would contain jcr:content(searched for jcr:content path of a page) in it.But to get the selective properties again u r adding the /jcr:content in the p.properties(=jcr:title cq:lastModified cq:tags /jcr:content/image/fileReference/) . You need to remove jcr:content and try.Please refer the below query for examplehttp://localhost:4502/bin/querybuilder.json?type=cq:PageContent&path=/content/g...

You can read below release notes for information and features added.https://docs.adobe.com/docs/en/aem/6-0/release-notes.htmlhttps://docs.adobe.com/docs/en/aem/6-1/release-notes.html