diff --git a/packages/client-runtime/src/state/threadHistoryMerge.ts b/packages/client-runtime/src/state/threadHistoryMerge.ts
index 6fd678b66b129..cec1774e6435d 100644
--- a/packages/client-runtime/src/state/threadHistoryMerge.ts
+++ b/packages/client-runtime/src/state/threadHistoryMerge.ts
@@ -112,10 +112,7 @@ export function mergeOlderHistoryIntoProjection(
       turnItemById.set(String(row.sourceItemId), row.item);
   }
   if (page.length === 0 && work === undefined) return projection;
-  let visible = [
-    ...page,
-    ...projection.visibleTurnItems.filter((row) => !pageKeys.has(projectedItemKey(row))),
-  ];
+  let visible: OrchestrationV2ProjectedTurnItem[];
   if (work && anchor && deferred) {
     let end = start + 1;
     while (end < projection.visibleTurnItems.length) {
@@ -147,6 +144,11 @@ export function mergeOlderHistoryIntoProjection(
       ...projection.visibleTurnItems.slice(end),
     ];
     if (anchor.visibility === "local") turnItemById.set(String(updated.item.id), updated.item);
+  } else {
+    visible = [
+      ...page,
+      ...projection.visibleTurnItems.filter((row) => !pageKeys.has(projectedItemKey(row))),
+    ];
   }
   if (
     visible.length === projection.visibleTurnItems.length &&