All my contacts and calendars are set to read-only

Hi, after upgrading to 10.1.4813 all my caldav and and carddav folders are set to read only. So i cannot edit calender entries and contacts or generate new ones. Thats really bad. All calendar and contact folders (Nextcloud and others) are concerned.

By the way: in other calendar and contact apps (Apple Contacts and Calendar, Thunderbird, BusyContacts) editing and generating new ones ist possible. Only in emclient not.