Steps to reproduce

1.  Define a content type that references itself or another type.
2.  Define an app that uses the above content type.
3. Create an item.
4. Create another item and attempt to link it to the first. The default JCR Chooser will be used as per docs.
5. Switch the chooser's workbench from tree view to list.

Expected results

1. I would expect the system nodes (rep:accesscontrol, entry, everyone, rep:policy) to be hidden. They are not usable and they are not shown in other workbench list views (ie. Pages, Assets)

Actual results

1. System nodes are visible and can be selected. See screenshot.

Workaround

#  I think the default app could be extended to explicitly filter nodes by type.

Development notes