This term refers to writing/storytelling rules that are oft-repeated…but which are dependent on context that isn’t included with them. The lack of context results in them being misinterpreted or misunderstood.
The most common example of this is “show, don’t tell” which is often taken literally in visual mediums like Films or Anime.

Basically, these ‘rules’ only make sense in a given context which is left out and unless you understand the deeper mechanics of storytelling, you won’t understand when and why those rules actually apply. It’s an issue of Storytelling Convention leaving out the important details.

More to be written soon.