[Bugfix] Add fix for JSON whitespace (#4189)

Co-authored-by: Ubuntu <ubuntu@ip-172-31-13-147.ec2.internal>

vllm/model_executor/guided_decoding/outlines_logits_processors.py

@@ -131,6 +131,11 @@ class CFGLogitsProcessor(BaseLogitsProcessor):
         fsm = CFGFSM(cfg, tokenizer)
         self.fsm = fsm
 
+    def init_state(self):
+        """Initialize state with a CFGFSM copy."""
+        super().init_state()
+        self.fsm = self.fsm.copy()
+
 
 @lru_cache
 def _adapt_tokenizer(tokenizer: PreTrainedTokenizerBase):