White marble, dark chocolate, one light source. Problem?

Not at all. Because pretty much everything you can actually see across the top of that box is not really the "correct" tonality of the chocolate. It's all specular highlights.

Controlling the density of specular highlights is what compresses the subject's wide tonal range and unifies everything into one smooth exposure.
__________Read more »

http://strobist.blogspot.com/2019/07/slc-1l-09-compressing-tonal-range-with.html