Job working hours is not getting overridden while making changes to an existing assignment

Summary:

We tried enabling Assignment standard working hours and derived working hours in Hire and employee, Employment info,change assignment,based on 23 b feature document.

When we try to enter the job details during 'hire an employee',the working hours and Derived working hours are getting updated and FTE is calculated based on derived working hours as expected,whereas if we try to perform change Assignment for employee and by giving the job data,the working hours are not getting updated and FTE is not getting calculated.

Example

In 'Change assignment' scenario,while trying to populate new job ,the derived working hours are getting updated.