Next Scheduled Activity in case selector get disappeared if we delete that activity

In Case selector , if we delete an activity which is currently displayed under "Next Sched." column then there blank is displayed under "Next Sched." column.
Ideally if current next scheduled activity is deleted, then next activity which fulfills scheduled activity criteria should get displayed.

Steps to replicate:-
1. Create a case of any type and find that case for "Find Cases" criteria.
2. Go to "Manage Case" and delete the activity which is currently displayed under Next Sched. of Case selector.
3 Though there is an activity which is having activity_date_time > currentDate and status = scheduled, its not get displayed but displaying blank (------).