[Bug]: GatedDeltaNet metadata builder classifies a stateless first chunk as a decode (same root cause as #51483)
![[Bug]: GatedDeltaNet metadata builder classifies a stateless first chunk as a decode (same root cause as #51483)](https://www.chat-gpts.plus/wp-content/uploads/2026/09/51562-14e6939c-768x403.jpg)
该报错出现在 vLLM 的 GatedDeltaNet(GDN)路径上,当一个调度批次里全部都是长度为 1 token 的行、且其中至少有一行是首次 chunk( num_computed_tokens == 0 )时,共享的 GDNAttentionMetadataBuilder 会把这条无状态的





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