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This fixes some spec decode failures but not all of them. Specifically, https://github.com/vllm-project/vllm/blob/main/.buildkite/test-pipeline.yaml#L283 has been fixed, but there are more failures from the next line VLLM_ATTENTION_BACKEND=FLASH_ATTN pytest -v -s spec_decode --ignore=spec_decode/e2e/test_multistep_correctness.py --ignore=spec_decode/e2e/test_mtp_correctness.py. I have been debugging them and the root cause points to #17084. cc @WoosukKwon