So the proposed solutions seems to be to update the Ryzen chipset drivers.
The thing is: This is a virtualized environment. The VM doesn't have the Ryzen chipset. It has a Q35 (QEMU) chipset.
The host is running a Linux 5.0 kernel, so I can't update anything there either.

First some system info:
Windows 10 virtual machine (QEMU) with PCIe pass-through (might be related to virtualization?)
AMD Ryzen 1700X (8 cores assigend to the VM)
ASRock Taichi X370 (newest BIOS/UEFI)
Powercolor RX Vega 64
32GB RAM (VM has 17GB assigned)

Mods used:
Auto Deconstruct (0.1.11)
Auto ...