387.12 - driver seems to skip every 2nd frame with Doom Vulkan running in Wine Staging

The game’s performance metrics (which can be enabled in the advanced graphics options) overlay shows fine performance and high fps, but the actual result which is displayed looks like half of the fps.
e.g. 100fps look like 50fps with 387.12, vsync is completely turned off in game and driver is at default settings. This occurs only with Vulkan, not OpenGL. With 384.90, also Vulkan looks totally smooth, so it’s likely a driver regression.

This is on GTX 1070 Arch Linux 4.13 with all the latest stable components and Wine Staging 2.17 and 2.18.