Problems after migrating a resource from Notes to M365 when rescheduling an appointment

We have a room in HCL Notes that contains both appointments via HCL Notes and M365 via coexistence

After we migrated the room to M365 we have problems moving appointments.

The appointments can be moved without an error message, but in the room calendar they are duplicated (at the old and the new time)
Is there a solution to solve this problem?