Hello @Nextcloud 📱☁️💻, whenever I mention "Krankenhaus" (the german word for "hospital") in an appointments title in the calendar module, the header image of the appointment editor changes from the first to the second image. Nice. But the whole appointment immediately disappears in my thunderbird view of the same calendar. If I change the title back to something not mentioning "hospital", the appointment just reappears in thunderbird. What are you doing to those appointments?