I had this issue during a job interview exercise. Their "follow these steps exactly" were simply broken. The root cause was that they were having people re-use the same shared remote amazon desktop system. Each candidate got their own home directory, but they wouldn't just reset the image between candidates. The person before me had used up 98% of the drive space. When I followed the 'step by step' guide, nothing worked, because it was out of drive space, but... I wasn't seeing 'out of drive space' messages directly - I was seeing their 'setup shell scripts' looking like they worked, but then nothing did.

I honestly thought this was some sort of trick exercise to see how I deal with broken processes, and I was writing fixes to their docs and shell scripts to deal with error states, and reported back to the person. I initially got a 'no, this isn't that sort of test. the docs work, just follow them'. After more back and forth, I got 'oh, I see that might be broken, yeah, just carry on'. I fixed what I could, made a couple commits back up, but was then told my commits needed more context, which I then added, and promptly never heard back from them again. Until... weeks later, HR reached out to say "we've gone with someone else". I recounted this story and got at least some semblance of feigned shock of 'that's not how any of this is supposed to go'. I'd kept some screenshots and emails, but they didn't care to go down that road.

tldr - Employers giving tests, please run through your own exercise processes now and then (or maybe even automate them with some smoke tests).