test: Fix verack race to avoid intermittent test failures

test/functional/test_framework/util.py

@@ -391,7 +391,11 @@ def connect_nodes(from_connection, node_num):
     from_connection.addnode(ip_port, "onetry")
     # poll until version handshake complete to avoid race conditions
     # with transaction relaying
+    # See comments in net_processing:
+    # * Must have a version message before anything else
+    # * Must have a verack message before anything else
     wait_until(lambda: all(peer['version'] != 0 for peer in from_connection.getpeerinfo()))
+    wait_until(lambda: all(peer['bytesrecv_per_msg'].pop('verack', 0) == 24 for peer in from_connection.getpeerinfo()))
 
 
 def sync_blocks(rpc_connections, *, wait=1, timeout=60):