diff --git a/packages/react-dom-bindings/src/events/DOMPluginEventSystem.js b/packages/react-dom-bindings/src/events/DOMPluginEventSystem.js
index 2d4518fe38..8d7a783bd5 100644
--- a/packages/react-dom-bindings/src/events/DOMPluginEventSystem.js
+++ b/packages/react-dom-bindings/src/events/DOMPluginEventSystem.js
@@ -648,9 +648,10 @@ export function dispatchEventForPluginEventSystem(
       // Special case: Flush continuous updates before the capture phase of a discrete event.
       if (
         eventSystemFlags & IS_CAPTURE_PHASE &&
+        node !== null &&
         getCurrentUpdatePriority() === DiscreteEventPriority
       ) {
-        const root: ?FiberRoot = node?.stateNode;
+        const root: ?FiberRoot = node.stateNode;
         if (root != null) {
           flushPendingContinuousUpdates(root);
         }
diff --git a/packages/react-dom/src/events/__tests__/DOMPluginEventSystem-test.internal.js b/packages/react-dom/src/events/__tests__/DOMPluginEventSystem-test.internal.js
index d9cf99a5f6..9a4504e5c6 100644
--- a/packages/react-dom/src/events/__tests__/DOMPluginEventSystem-test.internal.js
+++ b/packages/react-dom/src/events/__tests__/DOMPluginEventSystem-test.internal.js
@@ -1280,8 +1280,10 @@ describe('DOMPluginEventSystem', () => {
             );
           }
           const root = ReactDOMClient.createRoot(container);
-          root.render(<Test />);
-          expect(Scheduler).toFlushAndYieldThrough(['Render:0']);
+          await act(async () => {
+            root.render(<Test />);
+          });
+          expect(Scheduler).toHaveYielded(['Render:0']);
           const buttonElement = buttonRef.current;
 
           // Expect the click event to be able to get the latest state value set by mouse over events
@@ -3294,5 +3296,5 @@ describe('DOMPluginEventSystem', () => {
   }
 
   withEnableLegacyFBSupport(false);
-  // withEnableLegacyFBSupport(true);
+  withEnableLegacyFBSupport(true);
 });
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.js b/packages/react-reconciler/src/ReactFiberWorkLoop.js
index d44fe27800..58a83e4fdf 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.js
@@ -139,6 +139,7 @@ import {
   claimNextTransitionLane,
   claimNextRetryLane,
   includesSyncLane,
+  includesSomeLane,
   isSubsetOfLanes,
   mergeLanes,
   removeLanes,