HDR environment variable DXVK_HDR is not passed to game?

[osresearch]

There's some sort of GPU bug with HDR on my Linux system that requires that I pass DXVK_HDR=0 to Steam when starting it or else every water reflection blows out the rendering. After installing the mod it seems that this is no longer passed through to Big Walk. I've tried starting steam with it in the environment as well as adding it to the launch options for the game, but both ways it is back to the unplayable colors.

This might be due to old drivers; Big Walk has many warnings on startup, such as:

Running query: 1 - GpuTopology
CVulkanTopology: EnsureMeetsMinimumRequirements: adapter(0x56aeeba0) apiVersion is too old: 1.1.182
CVulkanTopology: failed to initialize device: 0x56aeeba0
Response: gpu_topology {
  gpus {
    id: 1
    name: "AMD RADV RENOIR"
    vram_size_bytes: 2505400320
    driver_id: k_EGpuDriverId_MesaRadv
    driver_version_major: 21
    driver_version_minor: 2
    driver_version_patch: 6
    luid: 0
  }
  default_gpu_id: 1
}