Using distortion files to correct image in Siril 1.4.0?

Trying to use distortion file to correct distortions in a Dwarf 3. Saves the file, but fails on registration.

The commands from my .ssf file are:

32 #plate solve sequence
33 seqplatesolve cb_light_ -disto=ps_distortion.wcs
34
35 #register
36 register cb_light_ -2pass -disto=ps_distortion.wcs

The logs from a test run show:

20:24:00: #plate solve sequence
20:24:00: Running command: seqplatesolve

20:24:00: Saving WCS file ps_distortion.wcs

20:24:13: Sequence processing succeeded.

20:24:13: Astrometric registration computed.

20:24:13: #register
20:24:13: Running command: register
20:24:13: Unknown distortion type ps_distortion.wcs, aborting.
20:24:13: Error in line 36 (‘register’): invalid arguments.
20:24:13: Exiting batch processing.

Using macOS Tahoe v26.1 on the last Intel iMac.