CS is the craziest of them all. Those should be the easiest to replicate. "Here is the code, here is a manifest of the environment/container/disk image/etc." You should be able to take that and run it and get the same results.

Or are you saying that the code itself is the problem and that they've done the equivalent of "return True" to get the result they want?

In my other comment I mentioned the CS results I've largely struggled to reproduce is because they include enough detail for you to get the gist of how it works, but not enough to avoid going down some rabbit holes. Also, not all publications include code. Many venues don't require it.