Exactly. Which is somewhat helpful for cyber defense because it helps prioritize fixes for those bugs that are in fact involved in a viable exploit chain. But it makes sense that one would want to restrict the ability of building those until the vulnerable software has been comprehensively fixed.

There is some meaningful evidence that Fable is fine-tuned or steered away from helping on this very task, which is not something that can be feasibly circumvented by a basic jailbreak.