The APEX_APPLICATION_PAGE_REGIONS view has a column parent_region_name that is empty even though the parent_region_id is populated.
Looking into the source code for the view
when r.parent_plug_id is not null then
( select *region_name*
where id = r.parent_plug_id )
I don't know what the region_name column is supposed to contain (it is almost always empty) but the correct column to use in this case would be plug_name
Can someone from Oracle please file a bug? BTW what is the purpose of the region_name column?