Exact-token stage replay can be repeatable yet unfaithful: BF16 live vs prefill KV states diverge on most suffixes, and bidirectional cache transplants make every tested continuation follow its donor.
URL https://arxiv.org/abs/2606.15621
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Stage-Replay Divergence Follows the KV Cache: Fixed-Prefix Precision Controls and Bidirectional Cache Transplantation
Exact-token stage replay can be repeatable yet unfaithful: BF16 live vs prefill KV states diverge on most suffixes, and bidirectional cache transplants make every tested continuation follow its donor.