OK, 44rh1n’s LUTs make it look more or less correct but the artifacts are still there.
blob:https://imgur.com/f36f802f-03e1-4734-af08-86c89094bcaf
When I look really closely, the artifacts are there even on the flat image and when I increase the saturation on the m2ts, they come out as well. Could there be something wrong with the file I have?