Bad histaux output

[anton-seaice]

When histaux output is configured in nuopc.runconfig to write mediator history output, the resulting netcdf is garbage. It looks like a combination of 0s and fill values. E.g. this example from histaux_ocn2med:

We found that using output of type double worked, but type float did not (by patching use_float=.false.). I didn't investigate further, but it looks like maybe the implementation of type float is incomplete in 'med_io_mod.F90' ?

P.S. I tried version cmeps0.14.35 and the latest main branch