I don't use DNGs much so I may be wrong but my expectation is that PM can read the embedded JPEG and therefore show changes made by Lightroom. So yes, I can make a DNG from my raw file and see the colour edits I'd made to the original raw when viewing in PM. But if I then go on to make further edits to the DNG I don't see those changed reflected in PM. Which I expected they would. Either the DNG's preview JPEG isn't being updated or PM isn't reading the latest version.
Thanks for any advice.