diff --git a/third_party/blink/renderer/core/dom/node.cc b/third_party/blink/renderer/core/dom/node.cc
index 6936978b34ca0..f74496a0d44bb 100644
--- a/third_party/blink/renderer/core/dom/node.cc
+++ b/third_party/blink/renderer/core/dom/node.cc
@@ -57,6 +57,7 @@
 #include "third_party/blink/renderer/core/dom/events/event_dispatcher.h"
 #include "third_party/blink/renderer/core/dom/events/event_listener.h"
 #include "third_party/blink/renderer/core/dom/events/event_path.h"
+#include "third_party/blink/renderer/core/dom/events/scoped_event_queue.h"
 #include "third_party/blink/renderer/core/dom/flat_tree_node_data.h"
 #include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
 #include "third_party/blink/renderer/core/dom/focus_params.h"
@@ -771,6 +772,12 @@ void Node::moveBefore(Node* new_child,
   // impossible for nested `moveBefore()` calls to occur. Assert that no atomic
   // move is already in progress.
   DCHECK(!GetDocument().StatePreservingAtomicMoveInProgress());
+
+  // Insertion can synchronously reach paths that emit scoped events (for
+  // example, form controls reacting to ancestor disabled-state changes). Defer
+  // any such events until the state-preserving atomic move has completed so
+  // that listeners never observe the intermediate state.
+  EventQueueScope queue_scope;
   GetDocument().SetStatePreservingAtomicMoveInProgress(true);
 
   ContainerNode* old_parent = new_child->parentNode();
diff --git a/third_party/blink/renderer/core/dom/node_test.cc b/third_party/blink/renderer/core/dom/node_test.cc
index d68bcfeff76f8..d48f5c3b20c5b 100644
--- a/third_party/blink/renderer/core/dom/node_test.cc
+++ b/third_party/blink/renderer/core/dom/node_test.cc
@@ -5,11 +5,13 @@
 #include "third_party/blink/renderer/core/dom/node.h"
 
 #include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
+#include "third_party/blink/renderer/bindings/core/v8/v8_mouse_event_init.h"
 #include "third_party/blink/renderer/bindings/core/v8/v8_shadow_root_init.h"
 #include "third_party/blink/renderer/core/css/resolver/style_resolver.h"
 #include "third_party/blink/renderer/core/css/style_engine.h"
 #include "third_party/blink/renderer/core/dom/comment.h"
 #include "third_party/blink/renderer/core/dom/element.h"
+#include "third_party/blink/renderer/core/dom/events/native_event_listener.h"
 #include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
 #include "third_party/blink/renderer/core/dom/layout_tree_builder.h"
 #include "third_party/blink/renderer/core/dom/processing_instruction.h"
@@ -18,7 +20,10 @@
 #include "third_party/blink/renderer/core/dom/slot_assignment_engine.h"
 #include "third_party/blink/renderer/core/dom/slot_assignment_recalc_forbidden_scope.h"
 #include "third_party/blink/renderer/core/editing/testing/editing_test_base.h"
+#include "third_party/blink/renderer/core/events/mouse_event.h"
+#include "third_party/blink/renderer/core/html/forms/spin_button_element.h"
 #include "third_party/blink/renderer/core/html/html_div_element.h"
+#include "third_party/blink/renderer/core/html/shadow/shadow_element_names.h"
 #include "third_party/blink/renderer/platform/heap/garbage_collected.h"
 
 namespace blink {
@@ -610,6 +615,66 @@ TEST_F(NodeTest, moveBefore_DetachAfterSlotReassignment) {
   EXPECT_FALSE(span->GetComputedStyle());
 }
 
+namespace {
+
+class AtomicMoveStateRecorder : public NativeEventListener {
+ public:
+  void Invoke(ExecutionContext*, Event* event) override {
+    fired_ = true;
+    Node* target = event->target()->ToNode();
+    in_atomic_move_ =
+        target->GetDocument().StatePreservingAtomicMoveInProgress();
+  }
+
+  bool fired_ = false;
+  bool in_atomic_move_ = false;
+};
+
+}  // namespace
+
+TEST_F(NodeTest, moveBefore_DefersScopedEvents) {
+  GetDocument().body()->SetHTMLUnsafeWithoutTrustedTypes(R"HTML(
+    <!DOCTYPE html>
+    <fieldset id="fs" disabled>
+      <legend id="lg"><input id="num" type="number" value="5"></legend>
+      <span></span>
+    </fieldset>
+  )HTML");
+
+  UpdateAllLifecyclePhasesForTest();
+
+  Element* fieldset = GetDocument().getElementById(AtomicString("fs"));
+  Element* legend = GetDocument().getElementById(AtomicString("lg"));
+  Element* input = GetDocument().getElementById(AtomicString("num"));
+
+  // The number input is inside the first <legend> of a disabled <fieldset>, so
+  // it remains enabled and its spin button responds to mouse events. Dispatch a
+  // mousedown to the spin button so that it acquires pointer capture and
+  // updates the value via a user edit.
+  ShadowRoot* shadow_root = input->UserAgentShadowRoot();
+  ASSERT_TRUE(shadow_root);
+  auto* spin_button = DynamicTo<SpinButtonElement>(
+      shadow_root->getElementById(shadow_element_names::kIdSpinButton));
+  ASSERT_TRUE(spin_button);
+  MouseEventInit* init = MouseEventInit::Create();
+  init->setButton(0);
+  auto* mousedown =
+      MakeGarbageCollected<MouseEvent>(event_type_names::kMousedown, init);
+  static_cast<Node*>(spin_button)->DefaultEventHandler(*mousedown);
+  ASSERT_TRUE(mousedown->DefaultHandled());
+
+  auto* listener = MakeGarbageCollected<AtomicMoveStateRecorder>();
+  input->addEventListener(event_type_names::kChange, listener);
+
+  // Reordering the <legend> children of a <fieldset> recomputes the disabled
+  // state of their descendant form controls, which makes the number input's
+  // spin button release capture and dispatch a scoped change event. The
+  // listener must not observe a state-preserving atomic move in progress.
+  fieldset->moveBefore(legend, nullptr, ASSERT_NO_EXCEPTION);
+  EXPECT_TRUE(listener->fired_);
+  EXPECT_FALSE(listener->in_atomic_move_);
+}
+
 #if DCHECK_IS_ON()
 TEST_F(NodeTest, ToStringDisallowedAssignmentRecalc) {
   GetDocument().body()->SetHTMLUnsafeWithoutTrustedTypes(R"HTML(