fix(physics): seal collision generations before activation

tests/AcDream.App.Tests/Streaming/LandblockPhysicsPublisherTests.cs

@@ -976,6 +976,43 @@ public sealed class LandblockPhysicsPublisherTests
             new Dictionary<uint, GfxObj>());
     }
 
+    [Fact]
+    public void ReloadedSeamAtomicallyRestoresAdjacentStaticAndClearsRepairMarker()
+    {
+        var fixture = Fixture();
+        CacheCylinderSetup(fixture.Cache);
+        WorldEntity neighbor = CylinderEntity(
+            0x80AAB401u,
+            new Vector3(192.25f, 12f, 0f));
+        Publish(fixture.Publisher, Build(FirstLandblock));
+        Publish(fixture.Publisher, Build(AdjacentLandblock, [neighbor]));
+        Assert.True(fixture.Engine.ShadowObjects.HasOwnerRowsInLandblock(
+            neighbor.Id,
+            FirstLandblock));
+
+        fixture.Publisher.RemoveLandblock(FirstLandblock);
+
+        Assert.Equal(1, fixture.Engine.ShadowObjects.WithdrawnPrefixMarkerCount);
+        Assert.False(fixture.Engine.ShadowObjects.HasOwnerRowsInLandblock(
+            neighbor.Id,
+            FirstLandblock));
+        LandblockPhysicsPublication pending = Begin(
+            fixture.Publisher,
+            Build(FirstLandblock));
+        Assert.Equal(1, fixture.Engine.ShadowObjects.WithdrawnPrefixMarkerCount);
+
+        fixture.Publisher.CompletePublication(pending);
+
+        Assert.Equal(0, fixture.Engine.ShadowObjects.WithdrawnPrefixMarkerCount);
+        Assert.True(fixture.Engine.ShadowObjects.HasOwnerRowsInLandblock(
+            neighbor.Id,
+            FirstLandblock));
+        Assert.True(fixture.Engine.ShadowObjects.HasOwnerRowsInLandblock(
+            neighbor.Id,
+            AdjacentLandblock));
+        Assert.Equal(1, fixture.Engine.ShadowObjects.RetainedRegistrationCount);
+    }
+
     private static LandblockCollisionBuild FlatCellClosure(
         PhysicsDatBundle bundle,
         uint envCellId)