Confirmed and fixed. Down-jump was probing for the foothold to drop to by taking the FIRST one in array order rather than the NEAREST one below you. On a map where a plain platform happens to sit earlier in the array than the solid floor, the check found the wrong candidate and refused. It now picks the nearest foothold below regardless of type, which is what you asked for. Please re-test dropping onto a thin platform specifically, and onto a platform that has another one directly beneath it.