Gate 1 screening results for tau-MnAl (P63/mmc). Fifth hexagonal structure family in the bias-correction protocol. Strikingly, despite sharing P63/mmc space group with D019 Mn3Ga, tau-MnAl massively underpredicts Tc (-306 K) rather than overpredicting (+70 K). This proves bias depends on Wyckoff occupancy, not just space group.