I encountered a bug with the generated calendar having an owner = null field. I have tried to reproduce but it doesn't seem to work. can you help me?

I encountered a bug with the generated calendar having an owner = null field. I have tried to reproduce but it doesn't seem to work. can you help me?

Which MS graph endpoint returned this calendar? Also how was this calendar created?
Sorry, this is my endpoint : https://graph.microsoft.com/v1.0/me
And this is step by step when i created calendar 
4 people are following this question.
How to extend microsoft graph calendar API quota?
Graph API: Calendars endpoint doesn't work (returns an empty array) for some users
Occasional 412 errors when listing calendars using Microsoft Graph API
Microsoft.Graph Silent crash on new calendar event
how to identifying updated child event in series(rucurring events) with help of calendar graph api?