diff --git a/pipeline_llm/inference.py b/pipeline_llm/inference.py
index 0fea1e8..2ad37d5 100644
--- a/pipeline_llm/inference.py
+++ b/pipeline_llm/inference.py
@@ -192,14 +192,18 @@ async def _render_tmpl(tmplstr, ns):
             te = getattr(ServerEnv(), 'tmpl_engine', None)
         except Exception:
             te = None
-    if te is None or not callable(getattr(te, 'renders', None)):
-        try:
-            from jinja2 import Environment
-            te = Environment(enable_async=True)
-        except Exception:
-            raise GovernError('模板引擎不可用：jinja2 未安装或未初始化，无法组包上游请求')
-    _tmpl_engine_cache = te
-    return await te.renders(tmplstr, ns)
+    if te is not None and callable(getattr(te, 'renders', None)):
+        _tmpl_engine_cache = te
+        return await te.renders(tmplstr, ns)
+    # 兜底：原生 jinja2.Environment 没有 renders 方法，用 from_string+render_async
+    try:
+        from jinja2 import Environment
+        env = Environment(enable_async=True)
+        _tmpl_engine_cache = None   # 原生引擎不缓存（避免掩盖后续真正的引擎注入）
+        t = env.from_string(tmplstr)
+        return await t.render_async(ns)
+    except Exception as e:
+        raise GovernError('模板渲染失败（组包不可用）：%s' % str(e)[:200])
 
 
 async def _render_headers(tmpl, ns):
@@ -274,10 +278,11 @@ async def _call_upstream_chat(ctx, payload):
     headers = await _render_headers(profile.get('headers', ''), ns)
     body = await _build_upstream_body(ctx, payload)
     timeout = int(_fnum(ctx.get('timeout')) or _TOTAL_TIMEOUT)
-    # 可诊断性：只记长度不记值（真 key 不落日志）
-    logger.info("inference: 组包 url=%s auth头长度=%d body字段=%s",
-                url.split('?')[0], len(headers.get('Authorization', '') or ''),
-                sorted(body.keys()))
+    # 可诊断性：只记长度不记值（真 key 不落日志）。print 确保进应用日志
+    # （模块 logging.getLogger 的 handler 未接应用日志管道，2026-09-04 实测）
+    print("[inference] 组包 url=%s auth头长度=%d body字段=%s" % (
+        url.split('?')[0], len(headers.get('Authorization', '') or ''),
+        sorted(body.keys())))
 
     last = None
     for attempt in range(_MAX_ATTEMPTS):