Weird hybrid pages which show content from mixed locations

Not sure what to do with this

I want to report an issue with Plone that has been bugging me for a very long time now. There is a lot of issue trackers around though and I don't know which one is the appropriate. I am sure that there is some talk about this already but I cant find it anywhere. It's the problem of when you try to visit a plone site and you type a url that combines more than one valid path for that site. It's hard to explain but its pretty simple with an example:
https://plone.org/documentation (GOOD) https://plone.org/support (GOOD) https://plone.org/documentation/support (BAD - weird hybrid page that shows mixed contents from different locations). Expected would be 404 page for https://plone.org/documentation/support
DavidJonas: hi