Anyone got a phase diagram for jet fuel?
That may be hard to come by. Problem is that typical fuels are not an "it", but a complex and widely varying collection of complex components blended to meet a set of specs. A batch could consist primarily of ground-up gerbils and would likely not be rejected if it met all the specs.
Similar might be said for various of the aircraft systems involved -- they are designed to meet reasonable specs derived from science, engineering, and experience. Sometimes circumstances arise that have not been fully contemplated in the specs, and unanticipated results ensue. BA038 may well be one of those situations where tried-and-true standards and specifications did not prevent a unique special case from having adverse effect.