From 17f6230dd93c1e7ac56ca19c76971823f98974ae Mon Sep 17 00:00:00 2001
From: VasN <pnvasanth@users.noreply.github.com>
Date: Wed, 25 Feb 2026 12:50:27 +0530
Subject: [PATCH] fix: deduplicate posts by ID when building feed items

Add a Set-based dedup in the items useMemo as a defensive fallback.
When pages contain overlapping posts (e.g. stale cursor returns first
page content as page 2), duplicates are now skipped client-side.
---
 packages/shared/src/hooks/useFeed.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/shared/src/hooks/useFeed.ts b/packages/shared/src/hooks/useFeed.ts
index dd93602116..2e9ccf0c74 100644
--- a/packages/shared/src/hooks/useFeed.ts
+++ b/packages/shared/src/hooks/useFeed.ts
@@ -316,8 +316,14 @@ export default function useFeed<T>(
     const plusEntryAsFirstCard = settings?.plusEntry?.flags?.asFirstCard;
 
     if (feedQuery.data) {
+      const seenPostIds = new Set<string>();
       newItems = feedQuery.data.pages.reduce((acc, { page }, pageIndex) => {
         page.edges.forEach(({ node }, index: number) => {
+          if (seenPostIds.has(node.id)) {
+            return;
+          }
+          seenPostIds.add(node.id);
+
           const adIndex = acc.length;
           const adItem = getAd({ index: adIndex });