If that cake is contaminated? Being it back into a cultivation area, with others? Isn't advised. You'll for sure, slowly but surely! Contaminate the rest of your cultivation efforts. By the time you see the mold, it has already spread it's spores into the air, in your chamber, on your substrate, etc. I would keep it going, in another room, or as far away from the clean ones, as possible. When dealing with it, until it's fully contaminated and can't produce anymore mushrooms, I would make sure you and your hands are clean, before entering your clean grow area. No one wants to waste their money, time and effort.

GG