Definite issue with missing grain:
VFX in shot, like stars in a window etc: NO GRAIN
no VFX: Normal Grain
Also sometimes issues with black levels. Sometimes the vfx stars in the window are fully black but then the black in the uniforms or Trois hair are grey instead of black. EDIT: Might be all the time when vfx in shot, like a window. The black of space is correct but uniforms etc are now grey.