…DSV3.1 C8.
### What this PR does / why we need it?
DeepSeek v3.1 C8 had a hanging issue when overlaying MTP and full graph
modes; this pull request resolves that issue.
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
- vLLM version: v0.18.0
- vLLM main:
ed359c497a
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Signed-off-by: pichangping <1337510399@qq.com>