fix: add vertices in the first layer to the vertices being run (#2594)

src/backend/base/langflow/api/v1/chat.py

@@ -106,6 +106,9 @@ async def retrieve_vertices_order(
         else:
             first_layer = graph.sort_vertices()
 
+        for vertex_id in first_layer:
+            graph.run_manager.add_to_vertices_being_run(vertex_id)
+
         # Now vertices is a list of lists
         # We need to get the id of each vertex
         # and return the same structure but only with the ids