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This is a problem in the Jasper library (https://github.com/mdadams/jasper).  It seems to be related to the number of bits per value of the input field.

Panel
bgColor#fff
Pick a decimal precision value that will avoid the assertion and preserves the required precision
  1. grib_set -s setDecimalPrecision=4,packingType=grid_jpeg input.grib2 output.grib2
  2. Check the statistics before and after
  3. grib_ls -n statistics input.grib2
  4. grib_ls -n statistics output.grib2
  5. Compare the results

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