diff --git a/NucleicRemote/NucleicRemote/Views/SessionDetailView.swift b/NucleicRemote/NucleicRemote/Views/SessionDetailView.swift
index 2bbe148..343ca8a 100644
--- a/NucleicRemote/NucleicRemote/Views/SessionDetailView.swift
+++ b/NucleicRemote/NucleicRemote/Views/SessionDetailView.swift
@@ -538,8 +538,12 @@ struct TranscriptList: View {
         }
         prewarmProgress.count = current.count
         guard !bodies.isEmpty else { return }
-        prewarmTask?.cancel()
-        prewarmTask = Task.detached(priority: .utility) {
+        // Chain batches instead of cancelling the in-flight one: each batch covers *new* rows
+        // only, so cancelling a predecessor (say, the big open batch, superseded by the first
+        // streamed row) would permanently drop its coverage. `onDisappear` cancels the head of
+        // the chain; a predecessor mid-parse just finishes its bounded batch into shared caches.
+        prewarmTask = Task.detached(priority: .utility) { [previous = prewarmTask] in
+            await previous?.value
             for body in bodies {
                 if Task.isCancelled { return }
                 MarkdownText.prewarm(body)