How to force processing of ics attachments?

I am using the C api to create a Note and add MIME content to the note. If the MIME content has a text/calendar section and an attachment of an ics file, the preview in Notes will first show the message and the ics attachment. Then when the view is refreshed, the ics attachment will be processed and the plain email will turn into a meeting and display all the expected information.

If this message had come to the server via SMTP instead of me programmaticaly adding it, the processing of the ics attachment would automatically occur. The message would always be displayed to the user as a meeting.

How can I force this processing through the API?

Thanks in advance.