event “visibility: private”, does not appear in the calendar

Good morning,?

We have implemented this plugin and it is completely satisfactory.

However, when we code the event as “visibility: public”, it is published and appears in the Calendar but it is visible to all Internet users (security problem)?

Putting this event with “visibility: password protected” is not satisfactory?

We would like to code the event as “visibility: private”, but in this case, it is not published and does not appear in the Calendar?

Can you tell us if there is a reason why this event does not appear in the calendar in “visibility: private”?

Best regards