The calendar organizer is wrong/fake, when an user check other's shared calendar, and the calendar permission is freebusyread

Question

[Reproduce Step]

1. user A shares his primary calendar with user B
2. user A sets the calendar permission to "Can view when I'm busy" to user B
3. user B sends GET calendars/{primary calendar id of user A}/events API

[Expect Step]

cause user B doesn't have permission to check the event organizer of user A(only freebusyread permission), so the organizer fields should be empty, and the isOrganizer field should be false

[Actual Step]

the organizer fields are all user B, and the isOrganizer fields are all true

[Another Question]

How does Outlook client check if the organizer field is wrong