Most Steam games offer a legacy OpenGL renderer. You can force Proton to use OpenGL translation (WineD3D instead of DXVK) by setting the launch option:
The Ivy Bridge architecture was released in 2012, long before the Vulkan API was finalized. Consequently, certain hardware-level features required by newer Vulkan versions are physically missing from the silicon. The Mesa developers have implemented as much as possible through software, but they cannot bridge every gap. Why Support is "Incomplete" The lack of full support boils down to three main factors: mesa-intel warning ivy bridge vulkan support is incomplete