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How to Include Optional Attendees in Calendar File when Converting It to MHT

Save a calendar ICS or Msg to MHT using MhtFormatOptions.WriteHeader | MhtFormatOptions.RenderCalendarEvent produces something like the following example:
The output doesnt show Optional attendees. Could some one help me with displaying Optional attendees along with the following information in MHTML file genereated using RenderCalendarEvent

Subject: Test Appointment
Location: https://consilio.zoom.us/j/test
Start: Fri 10/01/2021 08:30 PM
End: Fri 10/01/2021 09:00 PM
Show Time As: Busy
Organizer: John
Required Attendees: Mary

@pkometineni,
Thank you for contacting support. We will answer you as soon as possible.

@pkometineni,

We have reproduced the issue and started working on a fix. The EMAILNET-40440 task is registered in the Email project tracker. We will notify you as soon as the issue is resolved.