Reassigned booking does not move to new assignee's Outlook calendar

After reassigning a booking to a new staff member, the booking remains in the original staff member's Outlook calendar and does not display in the new staff member's Outlook calendar.

Expected behavior - after a booking is reassigned it will stop displaying in the original staff member's Outlook calendar and display in the reassigned staff member's Outlook calendar.

This is what we are experiencing:

1) Visitor books an appointment with staff member A
2) Visitor and staff member A both receive email notification about new appointment - appointment is displayed in staff member A's Outlook calendar
3) Bookings admin reassigns appointment to staff member B4) Visitor, staff member A and staff member B all receive email notification that accurately indicates staff member b as the new staff assigned staff member - appointment is still displayed in staff member A's Outlook calendar but not staff member B's

Everything works correctly except the appointment is never moved from the original staff member's Outlook (staff member A) to the reassigned staff member's (staff member B). We checked many hours later and then over 24 hours later to make sure it wasn't just a delay, but the appointment still displayed in the staff A's Outlook calendar, and not Staff B's. We checked both desktop Outlook and Outlook online and it was the same issue. We tested with several appointments and this behavior was consistent. The calendar in Microsoft Bookings correctly displays the reassigned appointments.