HEALPix output contains incorrect GRIB metadata
There is a problem with the GRIB messages written in DestinE.
The output is stored on a "real" HEALPix grid, i.e. the first grid cell is at 45 degrees east.
However, the value of longitudeOfFirstGridPointInDegrees is incorrectly set to 0 in the metadata.
This means that the GRIB messages from ICON in the DestinE FDBs are all incorrect in this form.
While the best solution would be to remove this parameter from the GRIB standard (as proposed for the CF conventions), we should fix this for now. The only question is whether this should be done during a simulation or for the next production run. By keeping the metadata consistent (even if it is wrong), it will probably be easier for downstream applications to handle cases of this known problem.