I just updated to SRC 8.4.24009.13521 and I noticed that the Artistic and Monochrome display modes have some shadows showing through the 3D model like they have some transparency now (clearly seen at the bottom of the 3D model - second image). This seems like a bug as there´s just the shadows showing through, nothing else. Nothing changed software or hardware wise.
Looks like the bug is related to the material transparency. If transparency is set to any value other than zero, it doesn´t show the “weird” shadows (e.g. a value of 0.001), but at the same time I lose the ground plane shadows as well.