diff --git a/pipeline_service/agent_loop.py b/pipeline_service/agent_loop.py
index a36c3fd..bf0b0a7 100644
--- a/pipeline_service/agent_loop.py
+++ b/pipeline_service/agent_loop.py
@@ -859,6 +859,10 @@ async def _rollback_task_chain(sor, project_id, task_id, rollback_role, comment)
     except (json.JSONDecodeError, TypeError):
         tp = {}
     new_params = {**tp, 'rollback_from': task_id, 'rollback_comment': comment}
+    # 清 pm_assigned：回退重做任务是系统重建的任务（非 PM 按模块清单派发），继承 target_task 的
+    # pm_assigned 会污染——若 target 是应用级 develop（历史脏数据带 pm_assigned=True），approve 后被
+    # 「模块级 develop → 跳过 deploy_test」误判，任务链断在 approved。与 _create_next_task 的 pop 对齐。
+    new_params.pop('pm_assigned', None)
     if prev_task:
         new_params['previous_task_id'] = getattr(prev_task, 'id', '')
         new_params['previous_role'] = _normalize_role(getattr(prev_task, 'role', ''))
@@ -1795,7 +1799,11 @@ async def pm_review_run(project_id, agent_id=None, model_name=None):
                     _tp = json.loads(getattr(task, 'params', '{}') or '{}')
                 except Exception:
                     _tp = {}
-                if task_role == 'agent.develop' and _tp.get('pm_assigned'):
+                # 模块级 develop = PM 用 create_tasks 直接派发（previous_role 为空）；应用级 develop =
+                # 系统派生/回退重做（previous_role=agent.design）。用 previous_role 区分而非 pm_assigned——
+                # pm_assigned 会被 design 任务污染（design 也是 PM create_tasks 派发、带 pm_assigned=True，
+                # 派生的应用级 develop 曾因此误判为「模块级」跳过 deploy_test）。
+                if task_role == 'agent.develop' and not _tp.get('previous_role'):
                     logger.info(f"模块级 develop approved，跳过 deploy_test（部署以应用为单位）: {task_id}")
                     return {"status": "approved", "task_id": task_id, "comment": comment,
                             "next_role": "", "skip_next": "module_not_deployed_independently"}
diff --git a/pipeline_service/bug_capability.py b/pipeline_service/bug_capability.py
index e9c67ff..aab5e25 100644
--- a/pipeline_service/bug_capability.py
+++ b/pipeline_service/bug_capability.py
@@ -127,8 +127,13 @@ async def confirm_bug(bug_id, iteration_id, who=None, agent_id=None):
 
 
 async def start_fix(bug_id, iteration_id, assignee_id="", who=None, agent_id=None):
-    """开始修复：confirmed → fixing（记录处理人）。"""
-    return await _transition(bug_id, iteration_id, [S_CONFIRMED], S_FIXING, 'start_fix',
+    """开始修复：confirmed/open → fixing（记录处理人）。
+
+    from 允许 open：PM review_rollback 回退 develop 处理部署/功能 Bug 时，走的是「回退重做」任务链
+    （隐含确认缺陷有效），不经过 confirm_bug，bug 停在 open。若 start_fix 只认 confirmed，
+    develop 在回退重做任务里修完缺陷后无法 start_fix→fix_bug，bug 永远 open、闭环断在 fixed 环节。
+    """
+    return await _transition(bug_id, iteration_id, [S_CONFIRMED, S_OPEN], S_FIXING, 'start_fix',
                              extra_updates={"assignee_id": assignee_id or ''},
                              who=who, agent_id=agent_id)