It is not uncommon for someone to leave a business with immediate effect in the time frame between finalising a payroll and pay date and so it is a common request to re-open a payroll and apply the leave date so that the final payrun is accurate.
When working with a re-opened pay run, if you mark an employee as a leaver, it will not take effect unless you restart the employee.
Support have advised that this is "expected system behaviour" and I disagree that this is how it should operate. This opens up risk in manually and unnecessarily re-processing an individual and means that you cannot make someone a leaver in a supplementary run.
It would be far more beneficial to be able to add a leave date without having to restart them.