I think I agree with the parent. While this can be made into a Gettier case by messing with the scope of the JTB (pull request broke it vs change broke it) I don't think it really works as intended by the author, and it feels like a poor example in a field teeming with much more straight forwards instances.

I can't simplify the explicit examples I have in my head enough to be worth typing up, but the gist is that I can be correct about the end behavior of a of a piece of code, but can be completely wrong about the code path that it takes to get there. I have good reasons to believe it takes that code path. But I don't know about signal handler or interrupt perhaps, that leads to the same behavior, but does not actually use the code path I traced out.

This happens to me reasonably often while debugging.