Split rendering does not work with external HRTFs

Split rendering outputs do not work with external HRTFs, e.g. running

-hrtf scripts/binauralRenderer_interface/binaural_renderers_hrtf_data/ivas_binaural_48kHz.bin BINAURAL_SPLIT_CODED 48 bit syn.dec 

returns

Error: HRTF binary file cannot be used in this output configuration.