Not overwriting MAST download of incomplete file

I believe astroquery.mast should be able to download and write over an incomplete file. However, it still is corrupted/incomplete even when the code recognizes the file as incomplete. Here are the steps to re-produce.

from astroquery.mast import Observations
from astropy.io import fits
fileN = 'jw01185103001_02102_00001-seg001_nrcalong_rate.fits'
with open(fileN,'wb') as f:
f.write(b'junk')
Observations.download_file('mast:jwst/product/'+fileN)
tmpHDU = fits.open(fileN)

I get `OSError: Empty or corrupt FITS file` whereas I was expecting astroquery to download a new file because it detects that the cached one is incomplete.

I'm using astroquery 0.4.10.dev9927 on Python 3.12.2

Start at the Observations.download_file entry point and reproduce the example with a four-byte file named jw01185103001_02102_00001-seg001_nrcalong_rate.fits. Trace the incomplete-file detection and download path; done means the cached file is replaced and fits.open(fileN) succeeds without an empty or corrupt FITS error.

Written by the indexing model from the issue text.