During shadow passes, objects outside the main view frustum are now longer tessellated (tessellation factor set to 1.0).

It means that tessellation can pop in shadows when moving the camera but we can't afford to tessellate everything anyway.

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.hlsl

     // Thus the following code play with both.
 
 #if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_SHADOWS)
-    bool frustumCulled = WorldViewFrustumCull(p0, p1, p2, maxDisplacement, (float4[4])_FrustumPlanes); // _FrustumPlanes are primary camera planes
+    bool frustumCulledCurrentView = WorldViewFrustumCull(p0, p1, p2, maxDisplacement, (float4[4])_FrustumPlanes); // _FrustumPlanes are primary camera planes
+    bool frustumCulledMainView = false;
-    bool frustumCulled = WorldViewFrustumCull(p0, p1, p2, maxDisplacement, (float4[4])unity_CameraWorldClipPlanes); // unity_CameraWorldClipPlanes is set by legacy Unity in case of shadow and contain shadow view plan
+    bool frustumCulledCurrentView = WorldViewFrustumCull(p0, p1, p2, maxDisplacement, (float4[4])unity_CameraWorldClipPlanes); // unity_CameraWorldClipPlanes is set by legacy Unity in case of shadow and contain shadow view plan
+    // In the case of shadow, we don't want to tessellate anything that is not seen by the main view frustum. It can result in minor popping of tessellation into a shadow but we can't afford it anyway.
+    bool frustumCulledMainView = WorldViewFrustumCull(p0, p1, p2, maxDisplacement, (float4[4])_FrustumPlanes);
 #endif
 
     bool faceCull = false;
     }
 #endif
 
-    if (frustumCulled || faceCull)
+    if (frustumCulledCurrentView || faceCull)
+    }
+    
+    // See comment above:
+    // During shadow passes, we decide that anything outside the main view frustum should not be tessellated.
+    if (frustumCulledMainView)
+    {
+        return float4(1.0, 1.0, 1.0, 1.0);
     }
 
     // We use the parameters of the primary (scene view) camera in order