diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.new.js b/packages/react-reconciler/src/ReactFiberBeginWork.new.js
new file mode 100644
index 000000000000..f5e2fe08f8f6
--- /dev/null
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.new.js
@@ -0,0 +1,14 @@
+// packages/react-reconciler/src/ReactFiberBeginWork.new.js
+export function beginWork(current: Fiber | null, workInProgress: Fiber, renderLanes: Lanes): Fiber | null {
+  if (current !== null) {
+    const oldProps = current.memoizedProps;
+    const newProps = workInProgress.pendingProps;
+    if (oldProps === newProps && !hasLegacyContextChanged() && !hasContextChanged()) {
+      // FIX: Ensure lanes are fully synchronized when handling deep Suspense boundaries
+      if (workInProgress.lanes !== current.lanes) {
+        return forceNestedHydration(current, workInProgress, renderLanes);
+      }
+      return bailoutOnAlreadyFinishedWork(current, workInProgress, renderLanes);
+    }
+  }
+}
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