[Bug] Fix Failure in /v1/chat/completions/render for Multimodal Requests (https://github.com/vllm-project/vllm/issues/35665) (#35684)

vllm/entrypoints/openai/api_server.py

@@ -368,6 +368,7 @@ async def init_app_state(
         request_logger=request_logger,
         chat_template=resolved_chat_template,
         chat_template_content_format=args.chat_template_content_format,
+        default_chat_template_kwargs=args.default_chat_template_kwargs,
         trust_request_chat_template=args.trust_request_chat_template,
     )
 
@@ -457,6 +458,9 @@ async def init_render_app_state(
 
     state.openai_serving_models = model_registry
 
+    # Expose tokenization via the render handler (no engine required).
+    state.openai_serving_tokenization = state.openai_serving_render
+
     state.vllm_config = vllm_config
     # Disable stats logging — there is no engine to poll.
     state.log_stats = False