Schema Extensions vs SingleValueExtendedProperties when copying events in a shared calender

Question

Hello,

We are working on a system which uses Graph API to communicate with Exchange Online. Until recently we used "Single Value Extended Properties" to store metadata for meetings/events. When we created new events in the shared calender, the metadata would also be copied.

We recently started using "Schema Extensions" for storing metadata instead, but now when we copy meetings within the shared calender, the metadata is no longer copied. Specifically:

• When copying meetings within our own calendar, the metadata IS copied
• When copying meetings whithin a shared calender, the metadata is NOT copied

We believe that it may be due to some security settings, meaning the metadata is not copied as we are not the owner of the other calendar. Is this correct?