This only happens in tablet (split view).

It can be reproduced in our master site:

1. Login in the site in a tablet device and go to the Tags tab.
2. Click "tag1".
3. Change the tag area selected. Check that all the items are empty.

To begin with, since the tags area always use the same path (index-area), changing the selected item in the left pane only changes the parameters of the page instead of recreating it. Maybe it would be better to add some parameters to the path so each tag area has its own page instance instead of reusing the same page instance.

It seems the index-area is not handling this parameter change properly, so it still uses some of the data from the previous area and this causes the problem.

Also, in this page we aren't using our ListItemsManager, it would be nice to use it too so the code is more consistent with other split view pages.