Tiny skip_sample adjust (#11225)

python/sglang/srt/managers/schedule_batch.py

@@ -663,7 +663,11 @@ class Req:
     @property
     def is_prefill_only(self) -> bool:
         """Check if this request is prefill-only (no token generation needed)."""
-        return self.sampling_params.max_new_tokens == 0
+        # NOTE: when spec is enabled, prefill_only optimizations are disabled
+        return (
+            self.sampling_params.max_new_tokens == 0
+            and global_server_args_dict["speculative_algorithm"] is None
+        )
 
     def add_latency(self, stage: RequestStage):
         if self.metrics_collector is None: