Well it just seems like it shouldn't happen but here is the info.
I am on a UHD timelime, the clip is a Canon Raw 8k log file, the grade has a Luminance Bal, Colour Balance, Cross Processed look and the contrast has been lifted. I have simply used two strokes of the paint brush in Fusion and the simple comp has completed changed the grade.
see image left side fusion altered (wrong) right side colour grade and look (right)
- left no, right yes
- fusion colour altered .jpg (238.42 KiB) Viewed 273 times
I am editing on a alienware laptop with 32GB of GPU.