Maybe I misunderstand, but if a pic is taken that has no photons and then processed by different standards, I at least, don't get the reason.
Fwiw, I do see thet jpeg did a poor job, but when starting with nothing what else would be expected?
It's probably similar to processing unexposed film. One can determine the base fog + density level and determine a number of things from that.
When starting with nothing, I'd expect to get very close to nothing in return. That was the value of shooting the inside of a lens cap. The RAW file gave pretty close to nothing. The jpg was filled with artifacts that shouldn't have been there.