I don’t use DXO Pure Raw because I can do the same with Photolab 4.
Just watch an excellent video of Robin Whalley on Youtube about the workflow: https://www.youtube.com/watch?v=xCSF9kfCrRk
Vignette correction in Photolab (and I think in Pure Raw as well) can cause issues. When I process my astrophotography images with DXO Photolab I always turn off the vignette correction because it causes banding issues, see Vignetting filter causing banding - #24 by LexB
I don’t know if DXO will change the options for Pure RAW, but if you want to have control you could switch to use Photolab.
Lex