diff --git a/backend/open_webui/socket/main.py b/backend/open_webui/socket/main.py
index 95d7ca962d..cc2c57d1ee 100644
--- a/backend/open_webui/socket/main.py
+++ b/backend/open_webui/socket/main.py
@@ -282,7 +282,11 @@ async def _stream_seq_allocate(user_id: str, message_id: str):
         seq = await asyncio.wait_for(
             REDIS.incr(key), timeout=RESUME_STREAM_REDIS_TIMEOUT_SEC
         )
-        _breaker_record_success()
+        # Don't record breaker success here — only append success counts
+        # as "Redis is healthy end-to-end." If INCR kept succeeding but
+        # XADD kept failing, counting INCR successes would reset the
+        # breaker on every frame and it would never trip for the exact
+        # failure mode we're trying to short-circuit.
         if seq == 1:
             try:
                 await asyncio.wait_for(
@@ -806,6 +810,7 @@ async def resume_stream(sid, data):
         capped.append(env)
         total_bytes += size
     capped.reverse()
+    truncated = len(capped) < len(envelopes)
 
     await sio.emit(
         'resume-stream:replay',
@@ -813,6 +818,7 @@ async def resume_stream(sid, data):
             'message_id': message_id,
             'request_id': request_id,
             'envelopes': capped,
+            'truncated': truncated,
         },
         to=sid,
     )
diff --git a/src/lib/components/chat/Chat.svelte b/src/lib/components/chat/Chat.svelte
index 68053ccd4e..5258af6507 100644
--- a/src/lib/components/chat/Chat.svelte
+++ b/src/lib/components/chat/Chat.svelte
@@ -738,6 +738,13 @@
 		// clears the fence if we're still the active request; if a newer
 		// request has taken over, let its own lifecycle handle cleanup.
 		const ownRequestId = payload?.request_id;
+		if (payload?.truncated) {
+			// Replay omitted older entries that wouldn't fit in the Socket.IO
+			// buffer. The final done checkpoint reconciles most content;
+			// non-DB-backed side-channel events (sources/embeds) may be
+			// missing until a full chat reload.
+			console.warn('resume-stream replay truncated for', messageId);
+		}
 		const envelopes = Array.isArray(payload?.envelopes) ? payload.envelopes : [];
 		try {
 			for (const envelope of envelopes) {