When I set a task color in Kanban board task I can see that color in project view, gantt view, even in grid view for task is fine. It is only list view for tasks that doesn't have the color. Until Kanban is more complete I still need to jump back and forth between these a lot.
Sorry, this is just an issue about displaying task colors at all for task list view. If I set the color and go to another view it reflects that change.