Calendar syncing via CalDav doesn't work

When I put my nextcloud calendar into the calendar app via the caldav link provided by nextcloud it only sync one event. The calendar on the next cloud webinterface stays responsive and the calendar works normally in all other operating system calendar apps... Tested on Elementary OS 5.1 Hera x86_64

---
Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/84896388-calendar-syncing-via-caldav-doesn-t-work?utm_campaign=plugin&utm_content=tracker%2F60388692&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F60388692&utm_medium=issues&utm_source=github).