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Topological superconductivity is expected to spur Majorana zero modes --exotic states that are also considered a quantum technology asset. FractionalJosephson effect is their manifestation in electronic transport measurements,often under microwave irradiation. A fraction of induced resonances, known asShapiro steps, should vanish, in a pattern that signifies the presence ofMajorana modes. Here we report patterns of Shapiro steps expected intopological Josephson junctions, such as the missing first Shapiro step, orseveral missing odd-order steps. But our junctions, which are InAs quantumwells with Al contacts, are studied near zero magnetic field, meaning that theyare not in the topological regime. We also observe other patterns such asmissing even steps and several missing steps in a row, not relevant totopological superconductivity. Potentially responsible for our observations isrounding of not fully developed steps superimposed on non-monotonic resistanceversus voltage curves, but several origins may be at play. Our resultsdemonstrate that any single pattern, even striking, cannot uniquely identifytopological superconductivity, and a multifactor approach is necessary tounambiguously establish this important phenomenon.

Missing odd-order Shapiro steps do not uniquely indicate fractional Josephson effect