After Switching to KDE Neon (User Edition) I'am unable to see "Shared Calendars" of other users.

Kolab/IMAP Backend is used for collaboration.

Within the "Contacts" Module i can see the "Other Users" node in the TreeView and can browse and watch/edit "Other Users"-shared AdressBooks. Within the Task/Calendar Module this TreeNode is missing. I'ts not a permission problem. If i use the exact same UserProfile with the "old" KUbuntu 18.04.04 provided Kontact everything works fine. Additionally: i can see the corresponding IMAP folders in within the "Serverside subscription"-Dialog.

Additionaly: the calendars are accessible via PIN-Module of the plasma-clock-widget.