Reproduced today on Snapshot.
The Courses All permission should provide the ability to add/edit/delete courses, but it looks like it no longer has that ability.
When logging in under this permission with a test user on Snapshot, there is no ability to add a course - the menu is missing:
On FOLIO Honeysuckle, logging in as a user with this permission does show the action menu:
So something happened – how did this permission change?