We started the default LR6/Tomcat bundle.
Create a new page with the asset publisher on it e.g. Test.
Enable the RSS subscription in the configuration.
When you click on the RSS subscription, at the bottom of the asset publisher portlet, it shows the RSS overview.
After clicking on one of the items it navigates to the selected item.
URL looks like: http://localhost:8080/web/guest/test/-/asset_publisher/0nNI/content/id/10473
Create another page and place the RSS portlet on it.
Configure the RSS portlet and use the RSS url of the asset publisher as input URL.
The overview looks correct but when you click on an item it should go to the Test page and show the selected item.
But the result is navigating to the page and showing the portlet only.
Now the url looks like: http://localhost:8080/web/guest/test/-/asset_publisher/0nNI/rss/web/guest/test/-/asset_publisher/0nNI/content/id/10482
The part of web/guest/test/-/asset_publisher/0nNI/rss/ is the link to the portlet and is not needed the url should result in http://localhost:8080/web/guest/test/-/asset_publisher/0nNI/content/id/10482 and then it works fine.