This was explained by DxO: https://support.dxo.com/hc/en-us/articles/34450035269277-Why-does-DxO-PhotoLab-now-export-DNG-files-with-only-technical-corrections .
See Compressed DNG brought to PL9, but with a bug - #19 by Egregius.
To put it short, translating some corrections from non-linear working colorspace back to camera linear data didn’t work too well with colors (and was probably reported as a bug).