I got this feedback on a Leica forum: DNG’s typically (but not always) have two color matrixes, one at D50, and one at D65. The issue with RT is that RT assumes that typical == always. The correct way to read a DNG is to read the tags to find out what color temperature each matrix is, and process accordingly. (CalibrationIlluminant1 and CalibrationIlluminant2). That’s why other raw processors don’t have that issue.