Thanks for reporting this. I took a look at some DNGs produced by the 11.0 DNG Converter from X-T3 RAFs. I am unable to reproduce the purple cast in internal builds of Adobe Camera Raw or Lightroom with either converted DNGs or RAF images. I did a quick test with Capture One 11 and I do see the issue with the DNGs you mentioned and with some RAFs shot in burst/sports mode, so as far as I can tell, this is not a bug in Adobe software.
Interesting. I'm wondering why choosing 'Linear (demosaiced)' seems to solve the C1 problem.
It's possibly due to an issue reading the black level tag in the files prior to the demosaic step, where in a linear DNG, this is already "baked in" to the pixel data.