August 3, 2026 Stage-Replay Divergence Follows the KV Cache: Fixed-Prefix Precision Controls and Bidirectional Cache Transplantation BF16下KV缓存的增量构建与一次性prefill虽然token相同但产生不同轨迹；FP32消除分歧；双向K/V缓存移植使所有分歧轨迹跟随donor llm-inference reasoning kv-cache reproducibility evaluation