I recently installed KiCAD 6 and noticed that some of the colors in step files are missing compared to KiCAD 5.1.10. For example, the cylinder inside the following part is orange in 5.1.10 and gray in 6.0.0: https://www.we-online.com/catalog/download/Download_STP_250-1243%20(rev1).STEP.
Also, FWIW, it shows as orange in FreeCAD 0.19.3.
Is there a setting in 6.0.0 that can be changed to display the color properly?