Terminated Instructor is visible to select as Instructor for an ILT activity

Summary:

24A
Instructor is terminated, instructor is still visible in Course>Offering and Activity page.
We created new course, new offering and new activity, the terminated instructor is still visible in the selection list.
Selecting them doesn't even throw a error.

Also, there is no option to put end date or inactivate the instructors. So all instructors who are terminated are still visible in new offerings and activities in the selection list.

We created new course, new offering and new activity, the terminated instructor is still visible in the selection list. Can this be controlled? or is it application behavior.