HAL-523 changed few things in master. However 2.5.x still suffers.

BrowserPresenter.readResource method turns for instance /subsystem=logging/root-logger=ROOT into /subsystem=logging/root-logger=*

This results in 500 exception since second address does not exist in server. As result, in Model editor, root logger is assigned ReadOnlyContext - which does nto allow to edit entries.