Impact of the incorrect orbit mirroring for a single orbit. We show a typical short-axis tube orbit derived in the triaxial potential by den Brok et al. (2021). The four panels show the evolution of L_tot (top left), L_z (top right), L_x (bottom left) and L_y (bottom right). The original orbit, correct (‘bug-fix’) and incorrect (‘nofix’) mirrors are shown by gray, blue, and red colours, respectively. We only show the four mirroring cases (out of eight) that are changed compared to the original code (see Table 1). In one panel, rows from top to bottom represent the 2nd, 3rd, 6th, and 7th mirrors, respectively. We show the orbit for only 25 (out of 200) revolutions to avoid crowding. The time of one orbital period is ∼0.06 Gyr.