Traps could exist in established modules.
Traps could also exist in open-source code.
Even in the textbooks you use to learn Inner Strength, there could be traps.
The final trap might not even be any actual code, but rather, by means of induction, it makes learners form a certain mental model. When dealing with specific problems, they would unconsciously expose weaknesses—and they wouldn't even realize it.
Imagine an Internal Martial Artist in this era, downloading over two hundred similar open-source modules online. Among them, nearly a hundred are understandable to him. If these nearly one hundred modules all have similar structural issues, even if he instinctively outputs a structure without problems, he will most likely feel something is wrong with himself and strive to correct his "bad habits."
In this regard, older hackers have an advantage.