Hardware:

• GPU: NVIDIA RTX 5070
• Driver: 590.48.01
• CPU: Intel i5-10400F
• RAM: 16 GB DDR4
• Resolution: 2560×1080 (21:9 ultrawide)
• OS: Garuda Linux KDE (Arch-based)
• Kernel: 6.18.5-zen

Proton versions tested:

• Proton 9.0-4
• Proton Experimental
• Proton-GE 10-32
• Proton-GE 9.x
• Wine-GE 9.x (via Heroic)

Summary of the issue:
The game launches and runs, but there are constant graphical artifacts:

• flickering lines on edges
• disappearing/reappearing geometry
• shimmering borders
• unstable image reconstruction

These artifacts appear:

• with DLSS ON or OFF
• with TAA
• with FSR2
• with Frame Generation OFF
• with Vulkan forced (PROTON_NO_D3D12=1)
• with NVAPI disabled (PROTON_HIDE_NVIDIA_GPU=1)

What was tested:

• clean compatdata prefix
• Vulkan forced
• DX12 disabled
• NVAPI disabled
• DXVK_ASYNC=1
• multiple Proton versions
• Wine-GE via Heroic
• Steam Runtime enabled
• different resolutions
• internal resolution scaling

Results:
Nothing removes the artifacts.
The issue seems specific to:

• NVIDIA RTX 4000/5000 series
• DX12 rendering path
• ultrawide resolutions (2560×1080)

Expected behavior:
Stable image without flickering or disappearing geometry.

Actual behavior:
Constant artifacts regardless of settings or Proton version.

Notes:
This looks like a DX12 + NVIDIA + ultrawide issue in the RE Engine.
Other players with RTX 4000/5000 report similar behavior.