diff --git a/airflow-core/src/airflow/jobs/triggerer_job_runner.py b/airflow-core/src/airflow/jobs/triggerer_job_runner.py
index adc87e802fa6f..8d2bdf99795e0 100644
--- a/airflow-core/src/airflow/jobs/triggerer_job_runner.py
+++ b/airflow-core/src/airflow/jobs/triggerer_job_runner.py
@@ -396,7 +396,8 @@ def _handle_request(self, msg: ToTriggerSupervisor, log: FilteringBoundLogger, r
             if isinstance(conn, ConnectionResponse):
                 conn_result = ConnectionResult.from_conn_response(conn)
                 resp = conn_result
-                dump_opts = {"exclude_unset": True}
+                # `by_alias=True` is used to convert the `schema` field to `schema_` in the Connection model
+                dump_opts = {"exclude_unset": True, "by_alias": True}
             else:
                 resp = conn
         elif isinstance(msg, GetVariable):
diff --git a/airflow-core/tests/unit/jobs/test_triggerer_job.py b/airflow-core/tests/unit/jobs/test_triggerer_job.py
index d3cecb5fc94e6..08e08f08c4fcb 100644
--- a/airflow-core/tests/unit/jobs/test_triggerer_job.py
+++ b/airflow-core/tests/unit/jobs/test_triggerer_job.py
@@ -645,7 +645,16 @@ async def test_trigger_can_access_variables_connections_and_xcoms(session, dag_m
     task_instance.trigger_id = trigger_orm.id
 
     # Create the appropriate Connection, Variable and XCom
-    connection = Connection(conn_id="test_connection", conn_type="http")
+    connection = Connection(
+        conn_id="test_connection",
+        conn_type="http",
+        schema="https",
+        login="user",
+        password="pass",
+        extra={"key": "value"},
+        port=443,
+        host="example.com",
+    )
     variable = Variable(key="test_variable", val="some_variable_value")
     XComModel.set(
         key="test_xcom",
@@ -675,12 +684,12 @@ async def test_trigger_can_access_variables_connections_and_xcoms(session, dag_m
                 "conn_id": "test_connection",
                 "conn_type": "http",
                 "description": None,
-                "host": None,
-                "schema": None,
-                "login": None,
-                "password": None,
-                "port": None,
-                "extra": None,
+                "host": "example.com",
+                "schema": "https",
+                "login": "user",
+                "password": "pass",
+                "port": 443,
+                "extra": '{"key": "value"}',
             },
             "variable": "some_variable_value",
             "xcom": '"some_xcom_value"',