Calendly overriding my meeting edits

When a new appointment comes in from Calendly, I keep the meeting that Calendly places on my Outlook calendar, but I update the title based on additional information and add internal contacts as needed to the meeting. I then send the new version of the meeting invitation to all who need to attend. This has worked perfectly for a few years. However, this morning, my title edits and additition invitees disappeared and I got an email starting with :Updated: : and then the original meeting title. The email has the original email details and ends with: “Rescheduled by (my name)
Reason - Updated from connected calendar event”

How can I prevent Calendly from updating the meeting event on my calendar once I make modifications?