read_raw_eeglab does not read nasion, lpa and rpa values from .set file #10474
Description
Describe the bug
read_raw_eeglab does not read properly the nasion, lpa and rpa coordinates of a .set file.
Steps to reproduce
This can be reproduced on the sample data eeglab_data.set file that comes with EEGLAB.
>>> import mne
>>> import os
>>> from mne_bids import write_raw_bids, BIDSPath
>>> import eeglabio
>>> file = "/Users/cmadjar/Documents/MATLAB/eeglab2022.0/sample_data/eeglab_data.set"
>>> raw = mne.io.read_raw_eeglab(input_fname=file, preload=False, verbose=True)
Reading /Users/cmadjar/Documents/MATLAB/eeglab2022.0/sample_data/eeglab_data.fdt
>>>
>>> raw.get_montage()
<DigMontage | 0 extras (headshape), 0 HPIs, 0 fiducials, 32 channels>
>>> raw.get_montage().get_positions()
.... 'coord_frame': 'head', 'nasion': None, 'lpa': None, 'rpa': None, 'hsp': None, 'hpi': None
However, when looking in the Matlab structure, the coordinates for nasion, lpa and rpa are indeed present in the file. So for some reason, this gets lost when loading the .set file with read_raw_eeglab
Additional information
Reproduced on several versions of mne and different OS.
Latest information:
>>> mne.sys_info()
Platform: macOS-11.3-x86_64-i386-64bit
Python: 3.9.12 (main, Mar 26 2022, 15:52:10) [Clang 13.0.0 (clang-1300.0.29.30)]
Executable: /Users/cmadjar/Development/python_venv/python_intel_3.9.4/eeg2bids_py3.9.12/bin/python
CPU: i386: 8 cores
Memory: Unavailable (requires "psutil" package)
mne: 1.0.0
numpy: 1.21.5 {blas=openblas, lapack=openblas}
scipy: 1.8.0
matplotlib: 3.5.1 {backend=MacOSX}
sklearn: 1.0.2
numba: 0.55.1
nibabel: Not found
nilearn: Not found
dipy: Not found
cupy: Not found
pandas: 1.4.1
pyvista: Not found
pyvistaqt: Not found
ipyvtklink: Not found
vtk: Not found
PyQt5: Not found
ipympl: Not found
pooch: v1.6.0
mne_bids: 0.10
mne_nirs: Not found
mne_features: 0.2
mne_qt_browser: Not found
mne_connectivity: Not found