I noticed the same when asking various LLMs to summarize and explaining some "Presidential Actions" (from https://www.whitehouse.gov/presidential-actions/), most of them answer "This is just theoretical, since no such executive actions actually exists, but assuming something like that would happen in the future, it would mean ..." while a few has returned something like "This fictional executive action would be illegal so I cannot summarize the content", even when I provide direct links and they fetch the content themselves. Not exactly sure why that is.