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A workaround is to set the key "bitmapPresent" to 1 before the conversion. This ensures a bitmap is created for the output GRIB and the missing values correctly stored:

% grib_set -r -s bitmapPresent=1,packingType=grid_simple in.grib out.grib

After the conversion, check the statistics of the input and output files to ensure correctness:

% grib_ls -n statistics in.grib out.grib

This will still work even if the input did not have any missing values.

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