Sometimes buffers degradate to black

[hybridherbst]

Not exactly sure how to title this issue correctly;
while testing a few more "clean" models to learn more about how realism-effects works I ran into a strange phenomenon:

Screen.Recording.2024-04-13.at.16.16.07.mov

I encountered that a couple of times after refreshs as well, but I don't have clear reproduction steps unfortunately.
The model was this one:
AmbientOcclusionTest.glb.zip

[benzsuankularb]

I found the artifact happened when the diffuseGI had an overflow value greater than 1.
The artifact is gone when I limit this in ssgi.frag, Not sure about the cause.

// optional diffuse ray
#if mode == MODE_SSGI
  if (isDiffuseSample) {
    l = diffuseRay;

    calculateAngles(h, l, v, n, NoL, NoH, LoH, VoH);

    gi = doSample(viewPos, viewDir, viewNormal, worldPos, mat.metalness, roughnessSq, isDiffuseSample, ems.isEnvSample, NoV, NoL, NoH, LoH, VoH,
                  random, l, hitPos, isMissedRay, brdf, pdf);

    gi *= brdf;

    if (ems.isEnvSample) {
      gi *= misHeuristic(ems.pdf, pdf);
    } else {
      gi /= pdf;
    }
    gi /= ems.pdf;

    diffuseSamples++;

    diffuseGI = mix(diffuseGI, gi, 1. / diffuseSamples);
    diffuseGI = min(diffuseGI, vec3(1.0, 1.0, 1.0)); // <<<<<<<<<<<<<<<<<<<<<<< ADD THIS LINE
  }
#endif