Crop .plot() issues with CHASE Data

[Goobley]

Describe the bug

I am using sunraster with CHASE data, and it has worked almost perfectly out of the box, thanks! I have encountered a strange issue whereby .plot() works fine on the spectrogram cube, and on a wavelength plane of the cropped cube (e.g. crop[71].plot()), but crop.plot() has a very strange wavelength grid. The first few planes appear correct (it's hard to be certain), but then the data seems to be wrong.

CHASE data can be acquired from SSDC here but this requires registration and login, so I have also made one file available on my OneDrive here.

To Reproduce

from astropy.io import fits
from astropy.wcs import WCS
import astropy.units as u
import matplotlib.pyplot as plt
from sunraster import SpectrogramCube
import numpy as np
from sunpy.coordinates import frames
from astropy.coordinates import SkyCoord

data = fits.open("RSM20240321T000051_0005_HA.fits")
data[1].header["CTYPE1"] = "HPLT-TAN"
data[1].header["CTYPE2"] = "HPLN-TAN"
data[1].header["CTYPE3"] = "WAVE"
wcs = WCS(data[1].header)

array = data[1].data
cube = SpectrogramCube(array, wcs, unit=u.DN)

pt1 = [SkyCoord(0*u.arcsec, 0*u.arcsec, frame=frames.Helioprojective), None]
pt2 = [SkyCoord(250*u.arcsec, 250*u.arcsec, frame=frames.Helioprojective), None]

crop = cube.crop(pt1, pt2)

Screenshots

Result of crop.plot

System Details

sunraster: 0.5.1
==============================
sunpy Installation Information
==============================

General
#######
OS: Ubuntu (22.04, Linux 5.15.146.1-microsoft-standard-WSL2)
Arch: 64bit, (x86_64)
sunpy: 5.1.4
Installation path: /home/cmo/miniconda3/envs/Dask312/lib/python3.12/site-packages/sunpy-5.1.4.dist-info

Required Dependencies
#####################
astropy: 6.1.0
numpy: 1.26.4
packaging: 24.0
parfive: 2.1.0
pyerfa: 2.0.1.4

Optional Dependencies
#####################
asdf: 3.2.0
asdf-astropy: 0.6.1
beautifulsoup4: 4.12.3
cdflib: Missing cdflib!=0.4.0,!=1.0.0,>=0.3.20; extra == "docs" or "tests" or "timeseries"
dask: 2024.5.1
drms: 0.6.4
glymur: Missing glymur!=0.9.5,>=0.9.1; extra == "docs" or "jpeg2000" or "tests"
h5netcdf: 1.3.0
h5py: 3.11.0
lxml: 5.2.2
matplotlib: 3.9.0
mpl-animators: 1.1.1
pandas: 2.2.2
python-dateutil: 2.9.0.post0
reproject: 0.13.1
scikit-image: Missing scikit-image>=0.18.0; extra == "docs" or "image" or "tests"
scipy: 1.13.1
sqlalchemy: Missing sqlalchemy>=1.3.4; extra == "database" or "docs" or "tests"
tqdm: 4.66.4
zeep: 4.2.1

Installation method

pip