diff --git a/chia/_tests/core/mempool/test_mempool_manager.py b/chia/_tests/core/mempool/test_mempool_manager.py
index aa658a714206..1dc53e27f2aa 100644
--- a/chia/_tests/core/mempool/test_mempool_manager.py
+++ b/chia/_tests/core/mempool/test_mempool_manager.py
@@ -3156,3 +3156,53 @@ def test_get_items_by_coin_ids(coin_ids: list[bytes32]) -> list[MempoolItem]:
     assert err == expected_err
     assert len(conflicts) == len(expected_conflicts)
     assert set(conflicts) == set(expected_conflicts)
+
+
+@pytest.mark.anyio
+async def test_new_peak_deferred_ff_items() -> None:
+    """
+    Covers the case where we update lineage info for multiple fast forward
+    singletons at new peak.
+    """
+    singleton_spend1 = make_singleton_spend(bytes32([1] * 32))
+    singleton1_id = singleton_spend1.coin.name()
+    singleton_spend2 = make_singleton_spend(bytes32([2] * 32))
+    singleton2_id = singleton_spend2.coin.name()
+    coins = TestCoins(
+        [singleton_spend1.coin, singleton_spend2.coin, TEST_COIN, TEST_COIN2],
+        {
+            singleton_spend1.coin.puzzle_hash: singleton_spend1.coin,
+            singleton_spend2.coin.puzzle_hash: singleton_spend2.coin,
+        },
+    )
+    mempool_manager = await setup_mempool(coins)
+    # Let's submit the two singletons transactions to the mempool
+    sb_names = []
+    for singleton_spend, regular_coin in [(singleton_spend1, TEST_COIN), (singleton_spend2, TEST_COIN2)]:
+        sb = SpendBundle([singleton_spend, mk_coin_spend(regular_coin)], G2Element())
+        sb_name = sb.name()
+        await mempool_manager.add_spend_bundle(
+            sb,
+            make_test_conds(spend_ids=[(singleton_spend.coin, ELIGIBLE_FOR_FF), (regular_coin, 0)], cost=1337),
+            sb_name,
+            uint32(1),
+        )
+        assert mempool_manager.get_mempool_item(sb_name) is not None
+        sb_names.append(sb_name)
+    # Let's advance the mempool by spending these singletons into new lineages
+    singleton1_new_latest = Coin(singleton1_id, singleton_spend1.coin.puzzle_hash, singleton_spend1.coin.amount)
+    coins.update_lineage(singleton_spend1.coin.puzzle_hash, singleton1_new_latest)
+    singleton2_new_latest = Coin(singleton2_id, singleton_spend2.coin.puzzle_hash, singleton_spend2.coin.amount)
+    coins.update_lineage(singleton_spend2.coin.puzzle_hash, singleton2_new_latest)
+    await advance_mempool(mempool_manager, [singleton1_id, singleton2_id], use_optimization=True)
+    # Both items should get updated with their related latest lineages
+    mi1 = mempool_manager.get_mempool_item(sb_names[0])
+    assert mi1 is not None
+    latest_singleton_lineage1 = mi1.bundle_coin_spends[singleton1_id].latest_singleton_lineage
+    assert latest_singleton_lineage1 is not None
+    assert latest_singleton_lineage1.coin_id == singleton1_new_latest.name()
+    mi2 = mempool_manager.get_mempool_item(sb_names[1])
+    assert mi2 is not None
+    latest_singleton_lineage2 = mi2.bundle_coin_spends[singleton2_id].latest_singleton_lineage
+    assert latest_singleton_lineage2 is not None
+    assert latest_singleton_lineage2.coin_id == singleton2_new_latest.name()
diff --git a/chia/full_node/mempool_manager.py b/chia/full_node/mempool_manager.py
index c621cd37d8a0..b66b1c45641f 100644
--- a/chia/full_node/mempool_manager.py
+++ b/chia/full_node/mempool_manager.py
@@ -833,7 +833,7 @@ async def new_peak(
             # rebasing a fast forward spend is more expensive than to just
             # evict the item. So, any FF spend we may need to rebase, defer
             # them until after we've gone through all spends
-            deferred_ff_items: set[tuple[bytes32, bytes32]] = set()
+            deferred_ff_items: set[tuple[bytes32, MempoolItem]] = set()
 
             for spend in spent_coins:
                 items = self.mempool.get_items_by_coin_id(spend)
@@ -856,7 +856,7 @@ async def new_peak(
                         spendbundle_ids_to_remove.add(item_name)
                         continue
 
-                    deferred_ff_items.add((spend, item_name))
+                    deferred_ff_items.add((spend, item))
 
             # fast forward spends are indexed under the latest singleton coin ID
             # if it's spent, we need to update the index in the mempool. This
@@ -864,7 +864,8 @@ async def new_peak(
             # new_coin_id, current_coin_id, mempool item name
             spends_to_update: list[tuple[bytes32, bytes32, bytes32]] = []
 
-            for spend, item_name in deferred_ff_items:
+            for spend, item in deferred_ff_items:
+                item_name = item.spend_bundle_name
                 if item_name in spendbundle_ids_to_remove:
                     continue
                 # there may be multiple matching spends in the mempool