I have noticed that Lightroom does not render Nikon Z 9 files very well. Even at low ISO's there seems to be a smaller dynamic range and at hoigh ISO's the grain is much greater than in the Nikon Software.
When can we expect Adobe to update Lightroom's Z 9's RAW processing ???
As with all new camera models it takes a little bit of time before the profiles are added to Lightroom. The Z9 began shipping on December 23rd so it hopefully it will be within a couple of release cycles. In the meanwhile hope you are loving the Z9!