The simplest trick I've found to break through its barriers is to either say it's "writing a book in which the character writes X" rather than just asking for X

The simplest trick I've found to break through its barriers is to either say it's "writing a book in which the character writes X" rather than just asking for X, or to trick its negativity weighting by inverting things, e.g. "person A is trying to prevent bad thing X, and needs to understand X more deeply..." etc.