diff --git a/langgraph/pregel/__init__.py b/langgraph/pregel/__init__.py
index cb88512c4..746a1e1ed 100644
--- a/langgraph/pregel/__init__.py
+++ b/langgraph/pregel/__init__.py
@@ -760,10 +760,11 @@ class Pregel(
                             )
                         )
                         checkpoint_config = {
+                            **checkpoint_config,
                             "configurable": {
                                 **checkpoint_config["configurable"],
                                 "thread_ts": checkpoint["id"],
-                            }
+                            },
                         }
                     # increment start to 0
                     start += 1
@@ -885,10 +886,11 @@ class Pregel(
                             )
                         )
                         checkpoint_config = {
+                            **checkpoint_config,
                             "configurable": {
                                 **checkpoint_config["configurable"],
                                 "thread_ts": checkpoint["id"],
-                            }
+                            },
                         }
                     # yield debug checkpoint
                     if stream_mode == "debug":
@@ -1031,10 +1033,11 @@ class Pregel(
                             )
                         )
                         checkpoint_config = {
+                            **checkpoint_config,
                             "configurable": {
                                 **checkpoint_config["configurable"],
                                 "thread_ts": checkpoint["id"],
-                            }
+                            },
                         }
                     # increment start to 0
                     start += 1
@@ -1162,10 +1165,11 @@ class Pregel(
                             )
                         )
                         checkpoint_config = {
+                            **checkpoint_config,
                             "configurable": {
                                 **checkpoint_config["configurable"],
                                 "thread_ts": checkpoint["id"],
-                            }
+                            },
                         }
                     # yield debug checkpoint
                     if stream_mode == "debug":
diff --git a/tests/test_pregel.py b/tests/test_pregel.py
index dc8e179c5..e1e1c4ee1 100644
--- a/tests/test_pregel.py
+++ b/tests/test_pregel.py
@@ -4372,10 +4372,15 @@ def test_branch_then(snapshot: SnapshotAssertion) -> None:
                 "step": 0,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {"my_key": "value", "market": "DE"},
                 },
@@ -4407,10 +4412,15 @@ def test_branch_then(snapshot: SnapshotAssertion) -> None:
                 "step": 1,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {"my_key": "value prepared", "market": "DE"},
                 },
@@ -4442,10 +4452,15 @@ def test_branch_then(snapshot: SnapshotAssertion) -> None:
                 "step": 2,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {"my_key": "value prepared slow", "market": "DE"},
                 },
@@ -4477,10 +4492,15 @@ def test_branch_then(snapshot: SnapshotAssertion) -> None:
                 "step": 3,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {
                         "my_key": "value prepared slow finished",
diff --git a/tests/test_pregel_async.py b/tests/test_pregel_async.py
index ed33e12e7..b641cb718 100644
--- a/tests/test_pregel_async.py
+++ b/tests/test_pregel_async.py
@@ -3584,8 +3584,6 @@ async def test_start_branch_then() -> None:
 
 
 async def test_branch_then() -> None:
-    pass
-
     class State(TypedDict):
         my_key: Annotated[str, operator.add]
         market: str
@@ -3629,10 +3627,15 @@ async def test_branch_then() -> None:
                 "step": 0,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {"my_key": "value", "market": "DE"},
                 },
@@ -3664,10 +3667,15 @@ async def test_branch_then() -> None:
                 "step": 1,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {"my_key": "value prepared", "market": "DE"},
                 },
@@ -3699,10 +3707,15 @@ async def test_branch_then() -> None:
                 "step": 2,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {"my_key": "value prepared slow", "market": "DE"},
                 },
@@ -3734,10 +3747,15 @@ async def test_branch_then() -> None:
                 "step": 3,
                 "payload": {
                     "config": {
+                        "tags": [],
+                        "metadata": {"thread_id": "10"},
+                        "callbacks": None,
+                        "recursion_limit": 25,
+                        "run_id": None,
                         "configurable": {
                             "thread_id": "10",
                             "thread_ts": AnyStr(),
-                        }
+                        },
                     },
                     "values": {
                         "my_key": "value prepared slow finished",