TemporalDegrain2 issue

[Lipomo]

When I change "GrainLevel" settings on TemporalDegrain2 for Vapoursynth (0, -1, -2...), there's absolutely no difference in the resulting video, every single pixel is the same.

At first I was thinking that was because this setting was dependent on another one, but even if I change all other settings, "GrainLevel" doesn't appear on the encoding script in "Show Vapoursynth Script". It's odd since it controls degrain strenght, which is quite important.


Is this setting really supported by Hybrid ?

Thank you