It is only failing in Python 3.8 because it is the only job with remote data enabled

and this is a remote data test

but why is it marked remote data when it is using a local file at https://github.com/astropy/photutils/blob/main/photutils/isophote/tests/data/synth_highsnr_table.fits is beyond my comprehension. Perhaps the function itself needs internet access or something? 🤷

Anyway, as @larrybradley found out, due to astropy/astropy#11843 , this data file now emits a warning. I see 3 possible paths forward:

1. Fix the data file header so it no longer emits the warning. This is the way to go if the original data is not compliant to FITS standards.
2. Ignore this warning in the test, preferably localize the ignore using with pytest.warns() only on the affected line.
3. If you think astropy should not be emitting this warning, report the bug upstream.

Wait, why did you merge this?

Multitasking fail. I immediately reverted it. :)

I fixed the test data in #1341 and everything passes now with astropy 5.1rc1.

Nice. Thanks!