diff --git a/examples/app-showcase/src/ui/pages/task-visualizations.pages.ts b/examples/app-showcase/src/ui/pages/task-visualizations.pages.ts
index 20cccdeeef..5755688e7f 100644
--- a/examples/app-showcase/src/ui/pages/task-visualizations.pages.ts
+++ b/examples/app-showcase/src/ui/pages/task-visualizations.pages.ts
@@ -96,6 +96,18 @@ export const TaskMapPage = definePage({
   label: 'Work Map',
   interfaceConfig: {
     source: 'showcase_task',
+    // `InterfacePageConfigSchema` is a CLOSED shape with no `map` (or
+    // `kanban`/`calendar`/…) key of its own — an author cannot declare a
+    // marker-title binding directly here (confirmed: `map: {...}` on this
+    // object is rejected as an unrecognized key). The one schema-legal
+    // channel for a per-visualization field binding on an interface page is
+    // `sourceView`, which `InterfaceListPage`'s `resolveSourceView` resolves
+    // against the source object's OWN named view — and `showcase_task`
+    // already declares exactly this binding on its `map` listView
+    // (task.view.ts, `listViews.map.map: { titleField: 'title',
+    // locationField: 'location' }`, from #9340). Referencing it here is a
+    // pure forward, not a duplicate declaration.
+    sourceView: 'map',
     columns: [...cols, 'location'],
     appearance: { showDescription: true, allowedVisualizations: ['map'] },
     userActions: { sort: false, search: true, filter: false, rowHeight: false, addRecordForm: false },
diff --git a/examples/app-showcase/test/task-map-marker-title.test.ts b/examples/app-showcase/test/task-map-marker-title.test.ts
new file mode 100644
index 0000000000..e7c8dd21b1
--- /dev/null
+++ b/examples/app-showcase/test/task-map-marker-title.test.ts
@@ -0,0 +1,60 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+import { describe, it, expect } from 'vitest';
+
+import { PageSchema } from '@objectstack/spec/ui';
+
+import { TaskMapPage } from '../src/ui/pages/task-visualizations.pages.js';
+import { TaskViews } from '../src/ui/views/task.view.js';
+
+/**
+ * Regression pin for the showcase Work Map's placeholder marker titles.
+ *
+ * `InterfacePageConfigSchema` is a CLOSED shape with no `map` (or `kanban` /
+ * `calendar` / …) key of its own — a per-visualization field binding cannot
+ * be declared directly on `interfaceConfig`. The one schema-legal channel is
+ * `sourceView`, which objectui's `InterfaceListPage` resolves against the
+ * source object's OWN named view and (since objectui#5908) forwards that
+ * view's `map` block verbatim to the renderer. `showcase_task` already
+ * declares the correct binding on its `map` listView (task.view.ts, #9340);
+ * this page has to REFERENCE it, or the renderer's `titleField || 'name'`
+ * fallback finds no `name` field on `showcase_task` and every marker title
+ * renders as a placeholder.
+ */
+describe('showcase Work Map — marker title binding (#11443)', () => {
+  it('references the object\'s `map` listView via sourceView', () => {
+    expect(TaskMapPage.interfaceConfig?.sourceView).toBe('map');
+  });
+
+  it('the referenced `map` listView still carries the title/location binding', () => {
+    const mapView = (TaskViews.listViews as Record<string, any>).map;
+    expect(mapView).toBeDefined();
+    expect(mapView.type).toBe('map');
+    expect(mapView.map).toEqual({ titleField: 'title', locationField: 'location' });
+  });
+
+  it('a `map` block declared directly on interfaceConfig is rejected — documents the schema boundary this page works around', () => {
+    const attempt = () =>
+      PageSchema.parse({
+        type: 'list',
+        object: 'showcase_task',
+        kind: 'full',
+        template: 'default',
+        isDefault: false,
+        regions: [],
+        name: 'showcase_task_map_direct_probe',
+        label: 'Work Map (direct-block probe)',
+        interfaceConfig: {
+          source: 'showcase_task',
+          columns: ['title', 'location'],
+          appearance: { showDescription: true, allowedVisualizations: ['map'] },
+          // `map` is not a key `InterfacePageConfigSchema` declares — the
+          // input TS type does not close over it (no excess-property error),
+          // but `.parse()` rejects it at runtime as an unrecognized key. That
+          // runtime rejection is exactly what this test pins.
+          map: { titleField: 'title', locationField: 'location' },
+        },
+      });
+    expect(attempt).toThrow(/[Uu]nrecognized key/);
+  });
+});