Why does Kingdom Come Deliverance flicker and show color overflow at night on Fanxiang S790E 4TB?

In the underwater city at night, neon lights exhibited strange color overflow and screen tearing under full Path Tracing, breaking immersion. I tried lowering the ray tracing level from Path Tracing to High, which improved FPS by 14 but severely degraded visual quality. I used DDU to clean uninstall the driver, installed the NVIDIA Studio driver, and cleared the 6.2GB shader cache using GamePP Shader Compile Queue Manager. Frame generation time converged to 12-15ms per RTSS, and 3DMark Path Tracing benchmark confirmed rendering errors were eliminated.