Microsoft Bookings - Attendee cancellation triggers name change and cancellation of full event

We schedule multiple session for different services (training courses) and have found that when an attendee cancels it sometimes changes the name of the event to include their name, sometimes adds cancelled to the name of the event and also sends a cancellation to the trainer but its still fully active and bookable in the booking calendar. We haven't been able to replicate this in testing but it looks like its happening to a few Microsoft bookings users. I've added a few images below to show to events cancelled on outlook but live on the calendar.