diff --git a/python/sglang/srt/disaggregation/prefill.py b/python/sglang/srt/disaggregation/prefill.py
index 3d541d522..4de1bfdb7 100644
--- a/python/sglang/srt/disaggregation/prefill.py
+++ b/python/sglang/srt/disaggregation/prefill.py
@@ -666,10 +666,12 @@ class SchedulerDisaggregationPrefillMixin:
                     continue
                 if getattr(req, "is_chunked", 0) != 0 or getattr(req, "start_send_idx", 0) != 0:
                     continue  # chunked / partially-sent: this forward isn't the full range
-                prefix = getattr(req, "prefix_indices", None)
-                # NB: prefix_indices is a tensor — never use `or`/truthiness on it.
-                if prefix is not None and len(prefix) != 0:
-                    continue  # cached prefix is HiCache-loaded, not forward-written -> lever B
+                # Cover the FULL sequence (cached prefix + new tokens). The per-layer
+                # backup hook fires after each layer's full processing, by which point
+                # layer L's HiCache-loaded prefix KV and forward-written new KV are both
+                # final — so transferring all of layer L's pages then is correct, and it
+                # overlaps the (dominant, at high cache-hit) prefix transfer with the
+                # forward. Verified by output-equality.
                 end_idx = min(len(req.fill_ids), len(req.origin_input_ids))
                 page_indices = _kv_locs_to_page_indices_cpu(
                     self.req_to_token_pool.req_to_token[req.req_pool_idx, 0:end_idx],