[Bugfix] Fix the Eagle3 inference failure issue. (#4721)
### What this PR does / why we need it?
Fix the Eagle3 inference failure issue.
error message: "EngineCore encountered an issue. See stack trace (above)
for the root cause."
Fixes https://github.com/vllm-project/vllm-ascend/issues/4323
### How was this patch tested?
`vllm serve /nfs/1_AscendPackage/05_weights_public/Qwen3-32B \
--served-model-name Qwen3-32B \ -tp 4 \ --host "0.0.0.0" \ --port "8000"
\ --trust-remote-code \ --speculative-config
'{"method":"eagle3","model":"/home/scd/qwen3_32b_eagle3/","num_speculative_tokens":4,"draft_tensor_parallel_size":1}'
\ --max-num-batched-tokens 4096 \ --max-model-len 4096`
```
curl http://localhost:8000/v1/completions \
-H "Content-Type: application/json" \
-d '{
"model": "Qwen3-32B",
"prompt": "hi, where is the capital of France?",
"max_tokens": 10,
"temperature": 0
}' | python3 -m json.tool
```
vLLM version: v0.11.0
vLLM-ascend version: v0.11.0rc2
Signed-off-by: 17764591921 <sunchend@outlook.com>
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