Steps to reproduce:

1. Run the following commands and check the results:

select * from ezpage_pages;
select * from ezpage_map_zones_pages;
select * from ezpage_zones;

2. On Ibexa admin, click on Create content, select Landing Page (do not publish or save or anything)
3. Check again Sql outputs: new entries added for those tables.

4. Add blocks on the landing page

5. Check again Sql views: new entries added for tables.

6. Delete the draft.

You will notice:

New entry is removed from  {{ezpage_page }}table;
New entries remain for tables: ezpage_map_zones_pages and ezpage_zones

Expected behavior:

New entries should be removed from all table since the draft is deleted