The asymmetry between the corners seems strange when compared to conventional waveguides or even Chern TIs, but is readily explained by considering the nature of topological protection in these ℤ2 pseudo-spin Hall TIs. Here, the bulk topology arises from the C6 symmetry of the lattice, which is broken at the interface. Thus, there is thus no true bulk-edge correspondence in these crystals, and the broken C6 symmetry at the interface leads to a small band gap between the edge states. This detail is the origin of the "weak" topological protection in ℤ2 pseudo-spin Hall TIs. Asymmetry is easily seen in Figure , where we have overlaid the mode profile with a hexagonal grid depicting the local point group symmetry of each unit cell. Each unit cell along the interface is outlined in yellow and belongs to the C2v point group, which does not have C6 symmetry. All other unit cells are outlined in black and belong to the D6h point group, which does possess C6 symmetry. Though the mode largely resides in the interfacial C2v cells as expected, when evanescently leaking into D6h cells it clearly favors the topological lattice over the trivial lattice. This behavior is consistent with the observations of Wu and Hu, as in pseudo spin-Hall TIs, energy flow at the ideal interface largely resembles the topological bulk lattice rather than the trivial phase. Thus, the mode is more accurately thought of as spanning the interfacial and topological lattice, and therefore the corners should no longer be expected to be equivalent. The D6h cells in the trivial lattice do not offer protection from scattering at defects because the circulating Poynting vector in each trivial unit cell does not lead to net propagation at the boundaries. In contrast, the D6h cells in the topological lattice offer protection because the circulation of the Poynting (pseudo-spin) is not confined to individual unit cells, leading to edge propagation. At the more robust majority-trivial corner, the mode is clearly seen partially occupying a topological D6h cell, thus still benefiting from this topological protection, Figure . In contrast at the more sensitive majority-topological corner, the mode is contained almost entirely in the interfacial C2v cells that lack C6 symmetry, where protection from disorder is minimal, Figure .