diff --git a/packages/api/src/stream/implementations/RedisEventTransport.ts b/packages/api/src/stream/implementations/RedisEventTransport.ts
index 2e17a1eeb1..fdb881c8d7 100644
--- a/packages/api/src/stream/implementations/RedisEventTransport.ts
+++ b/packages/api/src/stream/implementations/RedisEventTransport.ts
@@ -505,9 +505,13 @@ export class RedisEventTransport implements IEventTransport {
 
     try {
       const parsed = JSON.parse(message) as PubSubMessage;
+      /** Aborts, preempts, and abort acknowledgements are consumed by
+       *  transport-internal waiters (e.g. pending-ack resolution), not SSE
+       *  subscribers, so they must flow even with zero local subscribers. */
       if (
         streamState.count === 0 &&
         parsed.type !== EventTypes.ABORT &&
+        parsed.type !== EventTypes.ABORT_ACK &&
         parsed.type !== EventTypes.PREEMPT
       ) {
         return;