diff --git a/crates/papyrus_network/src/db_executor/mod.rs b/crates/papyrus_network/src/db_executor/mod.rs
index 9f041f46b2..109c3e4b1e 100644
--- a/crates/papyrus_network/src/db_executor/mod.rs
+++ b/crates/papyrus_network/src/db_executor/mod.rs
@@ -130,7 +130,7 @@ pub trait DBExecutorTrait {
         &mut self,
         query: Query,
         data_type: impl FetchBlockDataFromDb + Send + 'static,
-        sender: Sender<Vec<Data>>,
+        sender: Sender<Data>,
     );
 
     /// Polls incoming queries.
@@ -154,7 +154,7 @@ impl DBExecutorTrait for DBExecutor {
         &mut self,
         query: Query,
         data_type: impl FetchBlockDataFromDb + Send + 'static,
-        mut sender: Sender<Vec<Data>>,
+        mut sender: Sender<Data>,
     ) {
         let storage_reader_clone = self.storage_reader.clone();
         tokio::task::spawn(async move {
@@ -179,8 +179,10 @@ impl DBExecutorTrait for DBExecutor {
                     let data_vec = data_type.fetch_block_data_from_db(block_number, &txn)?;
                     // Using poll_fn because Sender::poll_ready is not a future
                     poll_fn(|cx| sender.poll_ready(cx)).await?;
-                    // TODO: consider implement retry mechanism.
-                    sender.start_send(data_vec)?;
+                    for data in data_vec {
+                        // TODO: consider implement retry mechanism.
+                        sender.start_send(data)?;
+                    }
                 }
                 Ok(())
             };
diff --git a/crates/papyrus_network/src/db_executor/test.rs b/crates/papyrus_network/src/db_executor/test.rs
index d4b6b94393..75a7338baa 100644
--- a/crates/papyrus_network/src/db_executor/test.rs
+++ b/crates/papyrus_network/src/db_executor/test.rs
@@ -32,7 +32,7 @@ async fn header_db_executor_can_register_and_run_a_query() {
         limit: NUM_OF_BLOCKS,
         step: 1,
     };
-    type ReceiversType = Vec<(Receiver<Vec<Data>>, DataType)>;
+    type ReceiversType = Vec<(Receiver<Data>, DataType)>;
     let mut receivers: ReceiversType = enum_iterator::all::<DataType>()
         .map(|data_type| {
             let (sender, receiver) = futures::channel::mpsc::channel(BUFFER_SIZE);
@@ -60,20 +60,20 @@ async fn header_db_executor_can_register_and_run_a_query() {
         _ = async {
             while let Some(res) = receivers_stream.next().await {
                 let (data, requested_data_type) = res.await;
-                assert_eq!(data.len(), NUM_OF_BLOCKS as usize);
+                if matches!(requested_data_type, DataType::SignedBlockHeader) {
+                    assert_eq!(data.len(), NUM_OF_BLOCKS as usize);
+                }
                 for (i, data) in data.into_iter().enumerate() {
-                    for data in data.iter() {
-                        match data {
-                            Data::BlockHeaderAndSignature(signed_header) => {
-                                assert_eq!(signed_header.block_header.block_number.0, i as u64);
-                                assert_eq!(*requested_data_type, DataType::SignedBlockHeader);
-                            }
-                            Data::StateDiffChunk (_state_diff)  => {
-                                // TODO: check the state diff.
-                                assert_eq!(*requested_data_type, DataType::StateDiff);
-                            }
-                            _ => panic!("Unexpected data type"),
+                    match data {
+                        Data::BlockHeaderAndSignature(signed_header) => {
+                            assert_eq!(signed_header.block_header.block_number.0, i as u64);
+                            assert_eq!(*requested_data_type, DataType::SignedBlockHeader);
+                        }
+                        Data::StateDiffChunk (_state_diff)  => {
+                            // TODO: check the state diff.
+                            assert_eq!(*requested_data_type, DataType::StateDiff);
                         }
+                        _ => panic!("Unexpected data type"),
                     }
                 }
             }
@@ -117,12 +117,10 @@ async fn header_db_executor_start_block_given_by_hash() {
         res = receiver.collect::<Vec<_>>() => {
             assert_eq!(res.len(), NUM_OF_BLOCKS as usize);
             for (i, data) in res.into_iter().enumerate() {
-                for data in data.iter() {
-                    let Data::BlockHeaderAndSignature(signed_header) = data else {
-                        panic!("Unexpected data type");
-                    };
-                    assert_eq!(signed_header.block_header.block_number.0, i as u64);
-                }
+                let Data::BlockHeaderAndSignature(signed_header) = data else {
+                    panic!("Unexpected data type");
+                };
+                assert_eq!(signed_header.block_header.block_number.0, i as u64);
             }
         }
     }
diff --git a/crates/papyrus_network/src/network_manager/mod.rs b/crates/papyrus_network/src/network_manager/mod.rs
index 8176406990..47df3cadf2 100644
--- a/crates/papyrus_network/src/network_manager/mod.rs
+++ b/crates/papyrus_network/src/network_manager/mod.rs
@@ -309,7 +309,6 @@ impl<DBExecutorT: DBExecutorTrait, SwarmT: SwarmTrait> GenericNetworkManager<DBE
                 self.db_executor.register_query(internal_query, data_type, sender);
                 self.query_results_router.push(
                     receiver
-                        .flat_map(futures::stream::iter)
                         .chain(stream::once(async move { Data::Fin(data_type) }))
                         .map(move |data| (data, inbound_session_id))
                         .boxed(),
diff --git a/crates/papyrus_network/src/network_manager/test.rs b/crates/papyrus_network/src/network_manager/test.rs
index cbf1b1eca8..a974003bde 100644
--- a/crates/papyrus_network/src/network_manager/test.rs
+++ b/crates/papyrus_network/src/network_manager/test.rs
@@ -228,7 +228,7 @@ impl DBExecutorTrait for MockDBExecutor {
         &mut self,
         query: Query,
         _data_type: impl FetchBlockDataFromDb + Send,
-        mut sender: Sender<Vec<Data>>,
+        mut sender: Sender<Data>,
     ) {
         let headers = self.query_to_headers.get(&query).unwrap().clone();
         self.query_execution_set.push(tokio::task::spawn(async move {
@@ -236,9 +236,10 @@ impl DBExecutorTrait for MockDBExecutor {
                 for header in headers.iter().cloned() {
                     // Using poll_fn because Sender::poll_ready is not a future
                     if let Ok(()) = poll_fn(|cx| sender.poll_ready(cx)).await {
-                        sender.start_send(vec![Data::BlockHeaderAndSignature(
-                            SignedBlockHeader { block_header: header, signatures: vec![] },
-                        )])?;
+                        sender.start_send(Data::BlockHeaderAndSignature(SignedBlockHeader {
+                            block_header: header,
+                            signatures: vec![],
+                        }))?;
                     }
                 }
                 Ok(())