diff --git a/src/ZB.MOM.WW.ScadaBridge.ManagementService/FlowDebug/FlowDebugRunner.cs b/src/ZB.MOM.WW.ScadaBridge.ManagementService/FlowDebug/FlowDebugRunner.cs
index 4b6952d6..1d964416 100644
--- a/src/ZB.MOM.WW.ScadaBridge.ManagementService/FlowDebug/FlowDebugRunner.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.ManagementService/FlowDebug/FlowDebugRunner.cs
@@ -152,7 +152,9 @@ public sealed class FlowDebugRunner
         // only known once the script runs. So the operator's scope is pushed into the
         // RouteHelper and enforced at route time, before any site traffic.
         var scope = await ResolvePermittedSiteIdentifiersAsync(sp, user, ct).ConfigureAwait(false);
-        var route = sp.GetRequiredService<RouteHelper>().WithTraceSink(collector.Add).WithSiteScope(scope);
+        var route = sp.GetRequiredService<RouteHelper>().WithTraceSink(evt => collector.Add(evt, lowPriority: FlowStepProjector.IsLogLine(evt))).WithSiteScope(scope);
+        // Step-logs D7: a ScriptLog row rides the collector's low-priority lane so the step rows
+        // emitted at run end are never crowded out of the inline copy (Replay stays complete).
         var executor = sp.GetRequiredService<InboundScriptExecutor>();
 
         InboundScriptResult result;
@@ -358,7 +360,7 @@ public sealed class FlowDebugRunner
         {
             try
             {
-                collector.Add(e);
+                collector.Add(e, lowPriority: FlowStepProjector.IsLogLine(e));
             }
             catch (Exception ex)
             {