diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Raw/RawManualTagEntryModalMergedConfigTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Raw/RawManualTagEntryModalMergedConfigTests.cs
index b09d9f6a..b81c38d8 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Raw/RawManualTagEntryModalMergedConfigTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Raw/RawManualTagEntryModalMergedConfigTests.cs
@@ -64,6 +64,36 @@ public sealed class RawManualTagEntryModalMergedConfigTests
         GetDriverConfigJson(modal).ShouldBe("{}");
     }
 
+    [Fact]
+    public async Task The_accessor_is_live_not_a_captured_snapshot()
+    {
+        const string merged = """{"endpoint":"10.0.0.1:44818","slot":0}""";
+
+        (string DriverType, string MergedConfigJson)? answer = null;
+        var svc = new FakeRawTreeService { OnLoadMergedProbeConfig = _ => answer };
+
+        var modal = new RawManualTagEntryModal();
+        SetParameters(modal, visible: true, deviceId: "dev-1", driverType: "AbCip");
+        InjectService(modal, svc);
+
+        await OpenAsync(modal);
+
+        // The delegate an already-rendered editor is holding. It must read the field on every call, not a
+        // value captured when the parameters were built — the resolve is awaited AFTER the rows are
+        // seeded, so a snapshot taken at build time is permanently "{}".
+        var accessor = GetAccessor(modal);
+        accessor().ShouldBe("{}");
+
+        SetParameters(modal, visible: false, deviceId: "dev-1", driverType: "AbCip");
+        await OpenAsync(modal);
+
+        answer = ("AbCip", merged);
+        SetParameters(modal, visible: true, deviceId: "dev-1", driverType: "AbCip");
+        await OpenAsync(modal);
+
+        accessor().ShouldBe(merged);
+    }
+
     /// <summary>
     ///     Sets the modal's <c>[Parameter]</c>s. By reflection because BL0005 forbids assigning component
     ///     parameters from outside the component, and this project treats warnings as errors.
@@ -108,7 +138,10 @@ public sealed class RawManualTagEntryModalMergedConfigTests
     }
 
     /// <summary>Invokes the <c>GetDriverConfigJson</c> Func the first seeded row's editor is handed.</summary>
-    private static string GetDriverConfigJson(RawManualTagEntryModal modal)
+    private static string GetDriverConfigJson(RawManualTagEntryModal modal) => GetAccessor(modal)();
+
+    /// <summary>The <c>GetDriverConfigJson</c> Func itself, so a test can retain and re-invoke it.</summary>
+    private static Func<string> GetAccessor(RawManualTagEntryModal modal)
     {
         var rowsField = typeof(RawManualTagEntryModal).GetField(
             "_rows",
@@ -127,6 +160,6 @@ public sealed class RawManualTagEntryModalMergedConfigTests
 
         var parameters = (IDictionary<string, object>)build!.Invoke(modal, [rows[0]])!;
 
-        return ((Func<string>)parameters["GetDriverConfigJson"])();
+        return (Func<string>)parameters["GetDriverConfigJson"];
     }
 }