Interestingly, I didn't see any reference to TestFitsData in the pipeline output, not sure why.
I just tried to run that test, and also got failures, so it isn't you.
Clearly we need to look at it. Someone must have disabled it.
Don't have time to look right now.
Be aware that we don't have great test coverage, though it has been improved in the past year. It is certainly an area that would be great to improve.
Thank you for looking into things, and looking forward to see what you come up with.