Use the greater-or-equal comparison (better behaved)

Assets/ScriptableRenderPipeline/ShaderLibrary/AreaLighting.hlsl

     float cosSqOmega = cosOmega * cosOmega;
 
     [branch]
-    if (cosSqOmega > sinSqSigma)
+    if (cosSqOmega >= sinSqSigma)
     {
         irradiance = sinSqSigma * saturate(cosOmega);
     }