diff --git a/Bonsai.Core.Tests/InspectBuilderTests.cs b/Bonsai.Core.Tests/InspectBuilderTests.cs
index 7c40640f..4a0cc06b 100644
--- a/Bonsai.Core.Tests/InspectBuilderTests.cs
+++ b/Bonsai.Core.Tests/InspectBuilderTests.cs
@@ -121,6 +121,33 @@ public void Build_DeferInspectBuilder_ReturnNestedVisualizerElement()
             Assert.AreSame(target, visualizerElement.Builder);
         }
 
+        [TestMethod]
+        public void Build_DeferWithNestedVisualizerInspectBuilder_ReturnNestedVisualizerElement()
+        {
+            // related to https://github.com/bonsai-rx/bonsai/issues/1896
+            ExpressionBuilder target = null;
+            var workflow = new TestWorkflow()
+                .AppendUnit()
+                .AppendNested(
+                    input => input
+                        .AppendUnit()
+                        .AppendSubject<Reactive.BehaviorSubject>(nameof(System.Reactive.Unit))
+                        .AppendNested(
+                            input => input
+                                .AppendUnit()
+                                .Capture(out target)
+                                .AppendOutput(),
+                            workflow => new Reactive.Visualizer(workflow))
+                        .AppendOutput(),
+                    workflow => new Reactive.Defer(workflow))
+                .ToInspectableGraph();
+            workflow.Build();
+
+            var output = workflow[workflow.Count - 1].Value;
+            var visualizerElement = ExpressionBuilder.GetVisualizerElement(output);
+            Assert.AreSame(target, visualizerElement.Builder);
+        }
+
         [TestMethod]
         public void Build_PropertyMappedInspectBuilderToWorkflowOutput_ReturnVisualizerElement()
         {
diff --git a/Bonsai.Core.Tests/TestWorkflow.cs b/Bonsai.Core.Tests/TestWorkflow.cs
index a81ec258..e973c7ed 100644
--- a/Bonsai.Core.Tests/TestWorkflow.cs
+++ b/Bonsai.Core.Tests/TestWorkflow.cs
@@ -94,6 +94,13 @@ public TestWorkflow AppendNested<TWorkflowExpressionBuilder>(
             return Append(workflowBuilder);
         }
 
+        public TestWorkflow AppendSubject<TSubjectBuilder>(string name)
+            where TSubjectBuilder : SubjectExpressionBuilder, new()
+        {
+            var subjectBuilder = new TSubjectBuilder { Name = name };
+            return Append(subjectBuilder);
+        }
+
         public ExpressionBuilderGraph ToInspectableGraph()
         {
             return Workflow.ToInspectableGraph();