Noted @kmilos . Thank you.
Coincidentally, I saw this post reg dng files from the same OnePlus Nord phone. https://discuss.pixls.us/t/looking-for-a-smartphone-with-a-good-camera/25660
A couple of dng files attached there are showing all image info in RT. exifprobe shows that those files have a diff content – more records than mine. So it looks to me that my problem may be related to the content of dng files emitted by my apps, and not to RT.
That said, I was under the (wrong?) impression that dng files have a standardized format. Perhaps they don’t. If that is indeed the case, then I am guessing that the reason my phone is emitting such dng files is related to
the respective camera apps (OnePlus and Open Camera), or possibly to the Google’s camera2 like API which both these apps must be using for generating dng files. Just a guess for now. I need to explore this more. Thanks again…