Even if you aren’t used to it, you’d be able to reason yourself through it, knowing how the language works, and would be aware that you need to reason through it. And it isn’t that LLMs don’t know that the language works that way, if you ask them about it. It also isn’t that they aren’t able to reason through it, if you ask them to do so. It’s that they lack awareness when to switch modes, lack the ability to have their knowledge interrupt their “intuitive” output and instead start reasoning about how to proceed.