I have absolutely no idea what kind of wizardry is that, but the ray epsilon fixed the issue. I owe you badly, thanks so much for help!

Hello guys!
I am currently working on some sci fi concepts, and decided to render the images in octane. I got stuck on alpha masking the decals with baked details of the helmet. Once I apply the black and white mask to the opacity slot, plane doesnt seem to be transparent at all, I have been ...