Brightness and contrast do not work regardless whatever values are set

[Needo]

Scanner: HP M476
.Capabilities.ICapContrast.GetValues() and .Capabilities.ICapBrightness.GetValues() returns ranges -1000 to 1000

twain.CurrentSource.Capabilities.ICapBrightness.SetValue AND
twain.CurrentSource.Capabilities.ICapContrast.SetValue.SetValue(x) return Success but there is no difference in scanned image, its brightness and contrast are always same regardless of provided values.

I tried third party TWAIN SDKs and they worked fine with the same scanner that means, scanner does support.

Any help how to verify that its correctly applying or forwarding the settings to scanner?

On further investigation noticed that it only applied if current source is closed and reopened before applying new settings.