Cannot create a calendar/ event with the same name as a deleted one

Tested on a local instance of XE 7.4.2

1. Create a new calendar "Red Clendar"
2. Delete it from the live table (go to wiki pages and delete it permanently also from there)
3. Create again a new calendar with the same name as the 1st one that was deleted.

Actual result:
-You get this message after you delete "Red Calendar" page permanently.
"The page xwiki:MoccaCalendar.Red Calendar.WebHome already exists. You can fill in a new page name (or edit xwiki:MoccaCalendar.Red Calendar.WebHome)."

Expected result:

• I expect to be able to give an old deleted calendar when I create a new one.