ortho projection does not focus on central longitude and latitude

Consider the following (zipped) netCDF file

regional-icon-test.zip

psy.plot.mapplot('regional-icon-test.nc', name='t2m', projection='ortho', cmap='viridis')

produces the following plot

and clon and clat are both 0. Instead, it should be

Clon and clat are probably not converted to degree when calculating clon and clat.