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This happens for stepType of "max" and "min". Unfortunately edition 1 does not support maximum and minimum in its "Time Range Indicator" table (Table 5). So ECMWF invented its own centre-specific combination to support this. There is no such issue in GRIB edition 2.
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Here we turn on the debugging to see what other keys get set when we change the stepTypestep type. We can see that the centre got changed to "98" (=ecmwf). If we had used a different step type (e.g., "accum") this would not have happened.
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