Mold on drywall only superficial?

So, we now have every builder's nightmare: mold. At the moment, only on the drywall and only in the corners, where they meet the (still) damp interior plaster. Partly already very extensive and black and fuzzy. We will not tolerate just surface stains. Now I read 90% that moldy drywall must definitely be replaced and not just treated with a mold spray. Primarily because drywall is apparently a super mold-friendly material that allows mold to multiply even beneath the surface. We will try to enforce a replacement of the walls (we also have an expert), but just for peace of mind, I would like to know: if the mold has only been there for a few days, is it possible that it is actually only superficial, or was the problem already lurking beneath the surface before it even appeared on the surface? Thanks in advance for your answers!

Hello :) How did it turn out for you? We just discovered the same problem today and are a bit desperate right now. Best regards

After the interior plaster, there were very light stains... repeatedly scrubbed off mold thoroughly and the problem was gone or since May nothing new has appeared for us

How bad is it with you?

So if it happens to be about the time after the screed installation when it is really damp, I can probably reassure you. I also got heart palpitations when I saw black spots on the drywall. It looked really bad, but in the end it was just an accumulation of construction dust that looked like mold because of the texture. So where condensation had accumulated. It doesn’t just start molding from one day to the next ...