The result of converting a .cr2 from a Canon 80D results in a .dng image that has a very pink/purple tint when viewed with the Mac Finder. Do not have the same problem if viewed with Bridge 2018 or if the image is converted to a .tif with DPP. I am using the current version of MAC and DNG software. Evidently the embedded .jpg created by DNG causes a problem with the Finder display. Any fixes other than not using DNG?
I don't have that camera. However, I downloaded a sample raw image taken with that model and converted it to DNG using DNG converter 10.4. I don't see the issue that you are describing. Using Windows 10.
I think Adobe knows about this. Unsure if/when they are fixing it. It may be a Mac problem.