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A speculative window whose accepted tokens end exactly on a recurrent block boundary selected the following block-table column for the committed state (commit plan) and recorded it as the running column (postprocess). That column can still be unallocated, so the next step reads an uninitialized page. Select the block that holds the last committed token, matching the (n - 1) // block convention used elsewhere in align mode. Applies to Kimi-K3 KDA and to the Qwen GDN/PLE RecoverSSM paths that share the plan. Fix and test from local-inference-lab/vllm a02f585d (Martin Vit, root cause reported by astra); the GDN/PLE align tests now expect the same convention. Signed-off-by: Jürgen Schmied <juergenschmied70@gmail.com> Co-authored-by: Martin Vit <martin@voipmonitor.org> Co-authored-by: Claude <noreply@anthropic.com>