Shared calendar always showing in sidebar

When I add new shared calendars (through Delegation → Add), they are automatically added to the calendar sidebar in the client. The problem is that even when I uncheck the calendars to be shown in the regular calendar view, they remain in the sidebar calendar.

When I press the cogwheel next to “Calendar” in the sidebar and choose “Select Folder(s)” these shared calendars are not available to check/uncheck in the list, but yet they still remain visible in the sidebar. It’s really annoying, and I also get reminders for these entries.

Is this just a matter of eM Client being slow in updating or a bug?