I hit a rather confusing issue with a release a while back, which initially appeared to be a Unicorn problem. But after investigating the details, I think this was actually an infrastructure problem causing some odd behaviour. I doubt this is a common problem, but still worth writing down in case it's a challenge for anyone else...
Ever had a tool that works reliably suddenly not work? I had a problem like that recently, and it lead to some experimentation that I think I may need to come back to later. So this is mostly so I can remember what I was doing when I get back to this. But as we move toward a more "platform agnostic" with more use of .Net Core on Linux, maybe there's something here that might help you too...