A treemap, an icicle and a sunburst draw the same tree with different marks — nested rectangles, stacked bands, and the same bands bent into rings — so MAIDR reads all three the same way: as a tree rather than as a grid. Left and Right move between siblings, Down steps into a node's children, and Up returns to its parent.
Only the leaves carry a value here. Every branch total is derived from what is under it, so the chart cannot report a parent that disagrees with its own children.