--- a/addons/core/Scripts/Game/ERR/40_Chat/ERR_NativeSmoke.c
+++ b/addons/core/Scripts/Game/ERR/40_Chat/ERR_NativeSmoke.c
@@ -726,11 +726,13 @@
 			{
 				DamageManagerComponent.Cast(m_ERRSmokePlayer.FindComponent(DamageManagerComponent)).EnableDamageHandling(false);
 				string convoyOutcome; System.GetCLIParam("errSmokeOutcome", convoyOutcome);
+				// Isolate this legacy finite-convoy fixture before prison escape can start
+				// unrelated opening hunters. Stop preserves already-created crew bodies.
+				if (ERR_HQ.Get().Hunters()) ERR_HQ.Get().Hunters().Stop();
 				// Both variants await HQ/mortar ticks, enabled by normal prison escape.
 				if (!ERR_Check(UnlockPrison(m_ERRSmokePlayer), "convoy fixture unlocks prison to start normal mission AI")) return;
 				if (convoyOutcome == "supply-convoys")
 				{
-				 if (ERR_HQ.Get().Hunters()) ERR_HQ.Get().Hunters().Stop();
 				 m_ERRSmokePlayer.SetOrigin(ERR_Actors.Ground("8800 0 2700"));
 				 PerceivableComponent convoyObserver = PerceivableComponent.Cast(m_ERRSmokePlayer.FindComponent(PerceivableComponent));
 				 if (!ERR_Check(convoyObserver != null, "convoy fixture observer has native perception component")) return;
--- a/tests/test_native_convoy_probe.py
+++ b/tests/test_native_convoy_probe.py
@@ -34,6 +34,9 @@
 branch=smoke[smoke.index('if (m_ERRTestConvoy)', smoke.index('if (m_ERRSmokeStep == 0)')):]
 branch=branch[:branch.index('m_ERRSmokeStep = 106;')]
 assert branch.count('UnlockPrison(m_ERRSmokePlayer)')==1
+# Prevent unrelated opening hunters before the capped legacy convoy is admitted.
+assert branch.count('ERR_HQ.Get().Hunters().Stop()') == 1
+assert branch.index('ERR_HQ.Get().Hunters().Stop()') < branch.index('UnlockPrison(m_ERRSmokePlayer)')
 assert branch.index('UnlockPrison(m_ERRSmokePlayer)') < branch.index('if (convoyOutcome == "supply-convoys")')
 runner=ROOT/'tools/headless_workbench.py'
 for extra in (['--project','core','--rounds','1','--timeout','600'],