https://bugs.winehq.org/show_bug.cgi?id=28251
--- Comment #16 from Matteo Bruni matteo.mystral@gmail.com --- (In reply to Andrey Gusev from comment #15)
Shadows are normal for me with wine-3.10-89-gb6c7b2d322, Mesa 18.0.2, NVIDIA Driver 390.59
I suspect 56d4de0fdee57b0acf02399525a893cc1b42d759 or df99c9b9f4190c4c0f96dd3c7e2f6632d4d9c077 did the trick. It would be great if you could do a reverse bisect to find what fixed it, assuming it was a change in Wine after all.
BTW, Mesa version won't matter if you're using proprietary Nvidia drivers.