jaw-dt I'm running dt 3.2.1 on Windows 10 but this is not a dt problem, the DNG files are corrupted in some way. They are purple when opened in RawTherapee and a JPEG converted from DNG using Faststone Image Viewer is also purple. Those all on Windows but I checked dt and RawTherapee on my Linux laptop as well; both purple.
Strangely Snapseed on my Android phone and on my iPad does not exhibit the problem, nor does Lightroom on my iPad (don't need paid Adobe CC account to use it there). Clearly there is something in the files that is ignored by some raw processors but not others. I also know that I processed some of these DNGs in Lightroom Classic when I still had a subscription and saw no problem then. All other DNGs created in Lightroom by converting RAFs are fine. There must have been a bug for a limited time so earlier and later imports were not affected.
I've uploaded a folder containing one of the DNGs, the JPEG from camera and several JPEGS from conversions should you want to take a look. The link is https://app.box.com/s/pxwakq88nzxyp1q1atah17y6kdmm71vh