diff --git a/src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/IOpcUaAddressSpaceSink.cs b/src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/IOpcUaAddressSpaceSink.cs
index 8ab43bdf..45f0eb7e 100644
--- a/src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/IOpcUaAddressSpaceSink.cs
+++ b/src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/IOpcUaAddressSpaceSink.cs
@@ -20,7 +20,8 @@ public interface IOpcUaAddressSpaceSink
     /// this projects the whole <see cref="AlarmConditionSnapshot"/>
     /// (Enabled/Active/Acked/Confirmed/Shelving/Severity/Message) onto it and recomputes Retain;
     /// otherwise it falls back to the legacy two-element <c>[Active, Acknowledged]</c> placeholder
-    /// variable. No OPC UA event is fired — that is T16's responsibility.</summary>
+    /// variable. A materialised condition also fires a Part 9 condition event on each transition (T16)
+    /// so subscribed clients receive the alarm event, not just the changed attributes.</summary>
     /// <param name="alarmNodeId">The OPC UA node ID of the alarm (== ScriptedAlarmId for materialised conditions).</param>
     /// <param name="state">The full condition state to project onto the node.</param>
     /// <param name="sourceTimestampUtc">The source timestamp in UTC.</param>
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs b/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs
index b8fed3f0..de2c51bb 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs
@@ -224,13 +224,21 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
             snapshot.Initialize(SystemContext, alarm);
             alarm.ReportEvent(SystemContext, snapshot);
         }
-        catch (Exception)
+        catch (Exception ex)
         {
             // A failed event report must NOT break the state projection or the calling actor: the node's
             // state has already been applied + ClearChangeMasks'd, so attribute subscribers still see the
-            // change; only the event delivery is lost. There is no logger on this CustomNodeManager2
-            // (the SDK base class carries none), so swallow rather than propagate. T19's live Client.CLI
+            // change; only the event delivery is lost. This CustomNodeManager2 carries no ILogger, so log
+            // through the SDK's static trace (Utils.LogError) instead of swallowing silently — a recurring
+            // failure here is then visible in the server log rather than invisible. T19's live Client.CLI
             // run is the integration proof that the happy path delivers.
+            // Utils.LogError routes to the SDK's trace sink. It's [Obsolete] in 1.5.378 in favour of an
+            // ITelemetryContext/ILogger this CustomNodeManager2 doesn't have wired — suppress the
+            // deprecation here (wiring the telemetry logger through is a separate follow-up); the point is
+            // that a recurring failure is visible in the server trace rather than silently swallowed.
+#pragma warning disable CS0618 // Type or member is obsolete
+            Utils.LogError(ex, "OtOpcUaNodeManager: failed to report Part 9 condition event for {0}", alarm.NodeId);
+#pragma warning restore CS0618
         }
     }