diff --git a/tests/AcDream.App.Tests/Streaming/LandblockBuildOriginTests.cs b/tests/AcDream.App.Tests/Streaming/LandblockBuildOriginTests.cs
index 1de0a773..9abb646a 100644
--- a/tests/AcDream.App.Tests/Streaming/LandblockBuildOriginTests.cs
+++ b/tests/AcDream.App.Tests/Streaming/LandblockBuildOriginTests.cs
@@ -221,14 +221,30 @@ public sealed class LandblockBuildOriginTests
             origin));
         streamer.Start();
 
-        var loaded = Assert.IsType<LandblockStreamResult.Loaded>(
-            await DrainFirstAsync(streamer));
+        LandblockStreamResult result = await DrainFirstAsync(streamer);
+
+#if DEBUG
+        // LandblockStreamer.HandleJob's near-payload check is "fail loud in
+        // Debug builds and strip in Release" (its own comment): the
+        // Debug.Assert fires on this deliberately-buggy factory, the test
+        // host's trace listener turns it into an exception, and the job's
+        // catch-all publishes it as Failed. That IS the designed Debug
+        // outcome — this test previously asserted the Release strip
+        // unconditionally and so failed on every full Debug run
+        // (found 2026-08-13; the campaign gates all run Release).
+        var failed = Assert.IsType<LandblockStreamResult.Failed>(result);
+        Assert.Equal(landblockId, failed.LandblockId);
+        Assert.Equal(84ul, failed.Generation);
+        Assert.Contains("Far-tier factory returned Near payload", failed.Error);
+#else
+        var loaded = Assert.IsType<LandblockStreamResult.Loaded>(result);
 
         Assert.Equal(LandblockStreamTier.Far, loaded.Tier);
         Assert.Empty(loaded.Landblock.Entities);
         Assert.Same(PhysicsDatBundle.Empty, loaded.Landblock.PhysicsDats);
         Assert.Null(loaded.Build.EnvCells);
         Assert.Equal(origin, loaded.Build.Origin);
+#endif
     }
 
     [Fact]