diff --git a/docs/agentic/dependency-phase-report.json b/docs/agentic/dependency-phase-report.json
index 3f9b01547..51d90419f 100644
--- a/docs/agentic/dependency-phase-report.json
+++ b/docs/agentic/dependency-phase-report.json
@@ -41,7 +41,7 @@
     }
   ],
   "plan_id": "gantt-dependency-phases",
-  "plan_sha256": "3d564bcdc6845bff249030ad73eb57ab6901d0a7c01e96a12ccde5f514ecd4b7",
+  "plan_sha256": "8b0125769b8efab1fdef44eddeb0bdeab5ed7a4fd4a48ea6941fd964b892a861",
   "topological_order": [
     "DPH-000",
     "DPH-100",
diff --git a/tests/agentic/test_gantt_projection.py b/tests/agentic/test_gantt_projection.py
index e63528ba3..56a97a452 100644
--- a/tests/agentic/test_gantt_projection.py
+++ b/tests/agentic/test_gantt_projection.py
@@ -43,8 +43,10 @@ def test_mermaid_projection_is_derived(self):
         self.assertIn("crit", text)
 
     def test_mermaid_collapses_title_whitespace(self):
-        result = project({**PLAN, "phases": [{**PLAN["phases"][0], "title": "line one\nline two"}]})
-        self.assertIn("line one line two", render_mermaid_gantt({**result, "schedule_mode": "dependency-derived"}))
+        phases = [{**phase} for phase in PLAN["phases"]]
+        phases[0] = {**phases[0], "title": "line one\nline two"}
+        result = project({**PLAN, "phases": phases}, start_date=date(2026, 9, 22))
+        self.assertIn("line one line two", render_mermaid_gantt(result))
 
     def test_valid_report_projects_evaluation_state(self):
         result = project(PLAN, report=REPORT)