diff --git a/tx-pool/src/process.rs b/tx-pool/src/process.rs
index 61d303b099..90760e3b26 100644
--- a/tx-pool/src/process.rs
+++ b/tx-pool/src/process.rs
@@ -473,8 +473,9 @@ impl TxPoolService {
 
     pub(crate) async fn find_orphan_by_previous(&self, tx: &TransactionView) -> Vec<OrphanEntry> {
         let orphan = self.orphan.read().await;
-        let ids = orphan.find_by_previous(tx);
-        ids.iter()
+        orphan
+            .find_by_previous(tx)
+            .iter()
             .filter_map(|id| orphan.get(id).cloned())
             .collect::<Vec<_>>()
     }
@@ -920,24 +921,19 @@ impl TxPoolService {
             }
         }
 
-        self.remove_orphan_txs_by_attach(attached.iter()).await;
+        self.remove_orphan_txs_by_attach(&attached).await;
         {
             let mut chunk = self.chunk.write().await;
             chunk.remove_chunk_txs(attached.iter().map(|tx| tx.proposal_short_id()));
         }
     }
 
-    async fn remove_orphan_txs_by_attach<'a>(
-        &self,
-        txs: impl Iterator<Item = &'a TransactionView>,
-    ) {
-        let mut ids = vec![];
-        for tx in txs {
-            ids.push(tx.proposal_short_id());
+    async fn remove_orphan_txs_by_attach<'a>(&self, txs: &LinkedHashSet<TransactionView>) {
+        for tx in txs.iter() {
             self.process_orphan_tx(tx).await;
         }
         let mut orphan = self.orphan.write().await;
-        orphan.remove_orphan_txs(ids.into_iter());
+        orphan.remove_orphan_txs(txs.iter().map(|tx| tx.proposal_short_id()));
     }
 
     fn readd_detached_tx(