External participant is spammed with appointment update emails

[ateuber]

Hi, we invited a distribution list to an appointment. The list contains an external/Gmail user who is now spammed with appointment update emails. I can see this is really the case in the mailserver log, but I cannot reproduce it with new appointments and inviting my own external/Gmail account. We solved the issue for now by removing her from the appointment, but this is not a solution. Does anybody have any idea what is going on here or how I can debug it? Thanks!

[ateuber]

I found out that it only happens when creating appointments in calenders shared by other users and selecting to create the appointment as the other user (instead of inviting the other user). Is there a reason for this behaviour or is it a bug?