I have a google account with multiple tasks folders. The folders are properly displayed in the left calendar treeview. On the tasks table list, in column "Calendar", for all tasks in all folders I have the same value "johndoe's Google" which is not at all relevant. A value of "Folder name ( johndoe@google.com )" would be much more useful, and/or if calendar tree colors could be used in the tasks listing. At this point I could find no way to visually identify a task's folder other than clicking on the task and reading the left pane's details, which more appropriately list "Calendar: johndoe's Folder name".
I err on the probability of this actually being a bug: When I create the task in KOrganizer, its "Calendar" column gets populated with "johndoes's Calendar name". When I restart Korganizer, it reverts back to "johndoe's Google".