There are several different forms the Tree of Life Diagrams. In the ones based on the teachings of Rabbi Isaac Luria (the Ari), Daat (Knowledge) is not counted as one of the 10 Sefirot, because Daat is the ‘outside’ of Keter and the ‘inside’ of Tiferet. Another way of saying that is, Daat is the interface between the (3 Sefirot of the) mind and the (7 Sefirot of the) body. In those Lurianic Tree of Life Diagrams, Malchut is fallen and alone, as seen in my picture ‘Ten Sefirot of Nothingness’.
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