NetCDF cell boundaries following CF

I’m trying to visualise piecewise constant data written into a netcdf file. The CF convention, as I understand it, allows to specify piecewise constant data in a cell through cell boundary definitions. I believe I have built a correct netcdf cf-compliant file. However, the NetCDFReader appears to simply ignore the cell boundaries.

The grid topology and the data is all correct, but it is still represented as point data, and not as cell data.

I wonder if this is simply not supported by the reader (as suggested by this thread from 2017, or there is something wrong in my netcdf file (343.9 KB)

This may be related to this other post