diff --git a/.cicd/defaults.json b/.cicd/defaults.json
index 3ec177b341..09326de0b9 100644
--- a/.cicd/defaults.json
+++ b/.cicd/defaults.json
@@ -3,7 +3,7 @@
        "target":"4",
        "prerelease":false
     },
-    "eossystemcontracts":{
-       "ref":"release/3.2"
+    "referencecontracts":{
+       "ref":"main"
     }
  }
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 88092b26f4..d4fde6c4cc 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -18,8 +18,8 @@ on:
         - default
         - true
         - false
-      override-eos-system-contracts:
-        description: 'Override eos-system-contracts ref'
+      override-reference-contracts:
+        description: 'Override reference contracts ref'
         type: string
 
 permissions:
@@ -57,9 +57,9 @@ jobs:
     outputs:
       cdt-target: ${{steps.versions.outputs.cdt-target}}
       cdt-prerelease: ${{steps.versions.outputs.cdt-prerelease}}
-      eos-system-contracts-ref: ${{steps.versions.outputs.eos-system-contracts-ref}}
+      reference-contracts-ref: ${{steps.versions.outputs.reference-contracts-ref}}
     steps:
-      - name: Setup cdt and eos-system-contracts versions
+      - name: Setup cdt and reference-contracts versions
         id: versions
         env:
           GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
@@ -67,7 +67,7 @@ jobs:
           DEFAULTS_JSON=$(curl -sSfL $(gh api https://api.github.com/repos/${{github.repository}}/contents/.cicd/defaults.json?ref=${{github.sha}} --jq .download_url))
           echo cdt-target=$(echo "$DEFAULTS_JSON" | jq -r '.cdt.target') >> $GITHUB_OUTPUT
           echo cdt-prerelease=$(echo "$DEFAULTS_JSON" | jq -r '.cdt.prerelease') >> $GITHUB_OUTPUT
-          echo eos-system-contracts-ref=$(echo "$DEFAULTS_JSON" | jq -r '.eossystemcontracts.ref') >> $GITHUB_OUTPUT
+          echo reference-contracts-ref=$(echo "$DEFAULTS_JSON" | jq -r '.referencecontracts.ref') >> $GITHUB_OUTPUT
 
           if [[ "${{inputs.override-cdt}}" != "" ]]; then
             echo cdt-target=${{inputs.override-cdt}} >> $GITHUB_OUTPUT
@@ -75,8 +75,8 @@ jobs:
           if [[ "${{inputs.override-cdt-prerelease}}" == +(true|false) ]]; then
             echo cdt-prerelease=${{inputs.override-cdt-prerelease}} >> $GITHUB_OUTPUT
           fi
-          if [[ "${{inputs.override-eos-system-contracts}}" != "" ]]; then
-            echo eos-system-contracts-ref=${{inputs.override-eos-system-contracts}} >> $GITHUB_OUTPUT
+          if [[ "${{inputs.override-reference-contracts}}" != "" ]]; then
+            echo reference-contracts-ref=${{inputs.override-reference-contracts}} >> $GITHUB_OUTPUT
           fi
 
   package:
@@ -312,21 +312,21 @@ jobs:
           rm ./*.deb
 
       # Reference Contracts
-      - name: checkout eos-system-contracts
+      - name: checkout reference-contracts
         uses: actions/checkout@v4
         with:
-          repository: eosnetworkfoundation/eos-system-contracts
-          path: eos-system-contracts
-          ref: '${{needs.v.outputs.eos-system-contracts-ref}}'
+          repository: AntelopeIO/reference-contracts
+          path: reference-contracts
+          ref: '${{needs.v.outputs.reference-contracts-ref}}'
       - if: ${{ matrix.test == 'deb-install' }}
-        name: Install eos-system-contracts deps
+        name: Install reference-contracts deps
         run: |
           apt-get -y install cmake build-essential
-      - name: Build & Test eos-system-contracts
+      - name: Build & Test reference-contracts
         run: |
-          cmake -S eos-system-contracts -B eos-system-contracts/build -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTS=On -DSYSTEM_ENABLE_LEAP_VERSION_CHECK=Off -DSYSTEM_ENABLE_CDT_VERSION_CHECK=Off
-          cmake --build eos-system-contracts/build -- -j $(nproc)
-          cd eos-system-contracts/build/tests
+          cmake -S reference-contracts -B reference-contracts/build -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTS=On -DSYSTEM_ENABLE_LEAP_VERSION_CHECK=Off -DSYSTEM_ENABLE_CDT_VERSION_CHECK=Off
+          cmake --build reference-contracts/build -- -j $(nproc)
+          cd reference-contracts/build/tests
           ctest --output-on-failure -j $(nproc)
 
   all-passing:
diff --git a/libraries/chainbase b/libraries/chainbase
index 85d33aa1f1..e7f8c9dd76 160000
--- a/libraries/chainbase
+++ b/libraries/chainbase
@@ -1 +1 @@
-Subproject commit 85d33aa1f193f384ec3aa852bbd84ed420f71f53
+Subproject commit e7f8c9dd76fd45a15195ed06049536737a9e4ce0
diff --git a/plugins/net_plugin/net_plugin.cpp b/plugins/net_plugin/net_plugin.cpp
index 1ac66587af..8fdc8bceb2 100644
--- a/plugins/net_plugin/net_plugin.cpp
+++ b/plugins/net_plugin/net_plugin.cpp
@@ -3086,7 +3086,7 @@ namespace eosio {
                  ("h", my_impl->get_chain_head_num()));
       if( !my_impl->sync_master->syncing_from_peer() ) { // guard against peer thinking it needs to send us old blocks
          uint32_t lib_num = my_impl->get_chain_lib_num();
-         if( blk_num < lib_num ) {
+         if( blk_num <= lib_num ) {
             fc::unique_lock g( conn_mtx );
             const auto last_sent_lib = last_handshake_sent.last_irreversible_block_num;
             g.unlock();
@@ -3103,6 +3103,13 @@ namespace eosio {
       } else {
          block_sync_bytes_received += message_length;
          my_impl->sync_master->sync_recv_block(shared_from_this(), blk_id, blk_num, false);
+         uint32_t lib_num = my_impl->get_chain_lib_num();
+         if( blk_num <= lib_num ) {
+            cancel_wait();
+
+            pending_message_buffer.advance_read_ptr( message_length );
+            return true;
+         }
       }
 
       auto ds = pending_message_buffer.create_datastream();
@@ -3770,7 +3777,7 @@ namespace eosio {
       connection_ptr c = shared_from_this();
 
       try {
-         if( cc.fetch_block_by_id(blk_id) ) {
+         if( blk_num <= cc.last_irreversible_block_num() || cc.fetch_block_by_id(blk_id) ) {
             c->strand.post( [sync_master = my_impl->sync_master.get(),
                              dispatcher = my_impl->dispatcher.get(), c, blk_id, blk_num]() {
                dispatcher->add_peer_block( blk_id, c->connection_id );
diff --git a/tests/nodeos_startup_catchup.py b/tests/nodeos_startup_catchup.py
index deeae78193..28364fe6c2 100755
--- a/tests/nodeos_startup_catchup.py
+++ b/tests/nodeos_startup_catchup.py
@@ -170,7 +170,10 @@ def waitForNodeStarted(node):
             waitForBlock(node0, catchupHead+5, timeout=twoRoundsTimeout*2, blockType=BlockType.lib)
 
         Print("Restart catchup node")
-        catchupNode.relaunch()
+        addSwapFlags = None
+        if catchup_num % 3 == 0:
+            addSwapFlags = {"--block-log-retain-blocks": "0", "--delete-all": ""}
+        catchupNode.relaunch(skipGenesis=False, addSwapFlags=addSwapFlags)
         waitForNodeStarted(catchupNode)
         lastCatchupLibNum=lib(catchupNode)
 
@@ -189,6 +192,12 @@ def waitForNodeStarted(node):
         catchupNode.interruptAndVerifyExitStatus(60)
         catchupNode.popenProc=None
 
+        logFile = Utils.getNodeDataDir(catchupNodeNum) + "/stderr.txt"
+        f = open(logFile)
+        contents = f.read()
+        if contents.count("3030001 unlinkable_block_exception: Unlinkable block") > 10: # a few are fine
+            errorExit(f"Node{catchupNodeNum} has unlinkable blocks: {logFile}.")
+
     testSuccessful=True
 
 finally:
diff --git a/tests/trx_generator/trx_provider.cpp b/tests/trx_generator/trx_provider.cpp
index 301a817c4c..b825baeff7 100644
--- a/tests/trx_generator/trx_provider.cpp
+++ b/tests/trx_generator/trx_provider.cpp
@@ -35,7 +35,10 @@ namespace eosio::testing {
    }
 
    void provider_connection::init_and_connect() {
-      _connection_thread_pool.start(1, {});
+      _connection_thread_pool.start(1,
+                                    [&](const fc::exception &e) {
+                                       wlog("Exception in connection_thread: ${e}", ("e", e.to_detail_string()));
+                                    });
       connect();
    };