ViewParameterMode.INCLUDE incudes all request parameters

I have a view config with navigation set to REDIRECT and viewParams set to INCLUDE like this:

@Page(navigation = Page.NavigationMode.REDIRECT,
viewParams = Page.ViewParameterMode.INCLUDE)
public class ShowProvider implements View {}

I use this view config as the result of an action method to navigate from an edit page back to a details page with a redirect using the (single) view param id for identifying the current item.

This works as expected, but additionally to the view param I get ALL request parameters in the url. As this is a redirect from a POST that is quite a list of parameters.

The parameters are added in ViewConfigAwareNavigationHandler.convertEntryToOutcome() if ViewParameterMode.INCLUDE is used on the view config - but I don't see why this is done?