Email notifications after reminder dismissed

Server:

  • Nextcloud version: 29 (but the issue is not new)
  • Calendar app

Desktops:

  • Thunderbird + TbSync + CalDAV provider

I have a shared calendar, everything works fine, including reminders and email notifications.

The olny problem but very annoying:

Every time user dismiss event reminder in the Thunderbird, the event is modified in the calendar on the Nextcloud server. And then all other users receive email notification about the event update.

How to get rid of these notifications? We want to be informed about the real event updates. But this is not real update, just reminder window in one client was closed…

Maybe it’s Thunderbird’s issue because with other clients (DAVx5 for Android, Nextcloud web interface) it doesn’t generate the event update. But I’m not sure - I believe Thunderbird updates only something that is not critical and should not cause the event update notifications for other users.