diff --git a/src/AcDream.App/Rendering/RetailPViewRenderer.cs b/src/AcDream.App/Rendering/RetailPViewRenderer.cs
index 6f88c0cf..d47d5778 100644
--- a/src/AcDream.App/Rendering/RetailPViewRenderer.cs
+++ b/src/AcDream.App/Rendering/RetailPViewRenderer.cs
@@ -465,6 +465,18 @@ public sealed class RetailPViewRenderer
         _candidateObserver?.BeginPViewFrame();
         try
         {
+            // FW4 slice 3: the outside-stage predicate's flood-membership set
+            // is THE WALK'S visited cells on walk frames (root flood +
+            // look-in floods — retail draws all of their objects inside
+            // LScape::draw, pre-clear). The old apparatus's drawableCells
+            // misses cells at the #456 seam band, dropping interior-parented
+            // outdoor emitters (the cathedral falls weenies) to the
+            // post-clear last pass, where the cleared depth lets them splat
+            // across terrain and water. drawableCells keeps its other roles
+            // (prepare filter, frame result) unchanged.
+            HashSet<uint> outsideStageFlood =
+                walkActive ? walkDriver!.VisitedCells : drawableCells;
+
             if (_sceneFrameProduct is not null)
             {
                 frameView = _sceneFrameProduct.BuildAndBorrow(
@@ -472,7 +484,7 @@ public sealed class RetailPViewRenderer
                     clipAssembly,
                     viewcone,
                     _lookInFrames,
-                    drawableCells,
+                    outsideStageFlood,
                     ctx.Cells,
                     ctx.AnimatedEntityIds,
                     ctx.RootCell.IsOutdoorNode);
@@ -544,7 +556,11 @@ public sealed class RetailPViewRenderer
                 foreach (var e in partition.Dynamics)
                 {
                     EntitySphere(e, out var c, out float r);
-                    if (DynamicDrawsInOutsideStage(e.ParentCellId, c, r, drawableCells, ctx.Cells))
+                    // FW4 slice 3: same walk-flood membership set as the
+                    // frame product's BuildOutsideDynamicRoutes — the two
+                    // predicate call sites must agree or routed and drawn
+                    // stages diverge.
+                    if (DynamicDrawsInOutsideStage(e.ParentCellId, c, r, outsideStageFlood, ctx.Cells))
                         _outsideStageDynamics.Add(e);
                 }
             }
diff --git a/src/AcDream.App/Rendering/Scene/RenderScenePViewFrameProduct.cs b/src/AcDream.App/Rendering/Scene/RenderScenePViewFrameProduct.cs
index 7bd78e5d..22a64027 100644
--- a/src/AcDream.App/Rendering/Scene/RenderScenePViewFrameProduct.cs
+++ b/src/AcDream.App/Rendering/Scene/RenderScenePViewFrameProduct.cs
@@ -1141,6 +1141,10 @@ internal sealed class RenderScenePViewFrameBuilder
     private readonly Dictionary<RenderProjectionId, int>
         _dynamicPositions = [];
     private int _dynamicCount;
+
+    // ACDREAM_PROBE_WALK_ROOT companion (throwaway): rate limiter for the
+    // [walk-dyn] outside-stage classification dump.
+    private uint _probeDynFrameCounter;
     private int _dirtyCount;
     private RenderSceneGeneration _indexGeneration;
     private ulong _indexRevision;
@@ -1320,6 +1324,9 @@ internal sealed class RenderScenePViewFrameBuilder
             return;
 
         int sliceCount = input.ClipAssembly.OutsideViewSlices.Length;
+        bool probeDynamics =
+            AcDream.Core.Rendering.RenderingDiagnostics.ProbeWalkRootEnabled
+            && ++_probeDynFrameCounter % 120 == 0;
         for (int sliceIndex = 0; sliceIndex < sliceCount; sliceIndex++)
         {
             int count = 0;
@@ -1328,19 +1335,23 @@ internal sealed class RenderScenePViewFrameBuilder
             {
                 RenderProjectionRecord record = _dynamics[i];
                 Sphere(in record, out Vector3 center, out float radius);
-                if (!RetailPViewRenderer.DynamicDrawsInOutsideStage(
-                        ParentCell(in record),
-                        center,
-                        radius,
-                        input.DrawableCells,
-                        input.Cells)
-                    || !input.Viewcone.SphereVisibleInOutsideSlice(
-                        sliceIndex,
-                        in center,
-                        radius))
+                bool outside = RetailPViewRenderer.DynamicDrawsInOutsideStage(
+                    ParentCell(in record),
+                    center,
+                    radius,
+                    input.DrawableCells,
+                    input.Cells);
+                bool cone = input.Viewcone.SphereVisibleInOutsideSlice(
+                    sliceIndex, in center, radius);
+                if (probeDynamics)
                 {
-                    continue;
+                    Console.WriteLine(
+                        $"[walk-dyn] slice={sliceIndex} id={record.Source.LocalEntityId:x} "
+                        + $"parent={ParentCell(in record)?.ToString("x8") ?? "null"} "
+                        + $"r={radius:F1} outside={(outside ? 1 : 0)} cone={(cone ? 1 : 0)}");
                 }
+                if (!outside || !cone)
+                    continue;
 
                 _survivors[count++] = record;
                 writer.AddDynamic(in record);