After the Nazis seized power in 1933, Lachnit's work was declared "degenerate" and confiscated by authorities. During this period he was not allowed to make art and worked as an exhibition designer. Much of his confiscated work was destroyed during the February 1945 firebombing of Dresden. His 1923 watercolours "Man and Woman in the Window" and "Girl at Table" were found in the Munich Art Hoard.