Index: source/simulation2/Simulation2.cpp
===================================================================
--- source/simulation2/Simulation2.cpp
+++ source/simulation2/Simulation2.cpp
@@ -54,12 +54,11 @@
 {
 public:
 	CSimulation2Impl(CUnitManager* unitManager, ScriptContext& cx, CTerrain* terrain) :
+		m_SimContext{terrain, unitManager},
 		m_ComponentManager{m_SimContext, cx},
 		m_MapSettings{cx.GetGeneralJSContext()},
 		m_InitAttributes{cx.GetGeneralJSContext()}
 	{
-		m_SimContext.m_UnitManager = unitManager;
-		m_SimContext.m_Terrain = terrain;
 		m_ComponentManager.LoadComponentTypes();
 
 		RegisterFileReloadFunc(ReloadChangedFileCB, this);
@@ -406,8 +405,7 @@
 
 		m_SecondaryTerrain = std::make_unique<CTerrain>();
 
-		m_SecondaryContext = std::make_unique<CSimContext>();
-		m_SecondaryContext->m_Terrain = m_SecondaryTerrain.get();
+		m_SecondaryContext = std::make_unique<CSimContext>(m_SecondaryTerrain.get());
 
 		m_SecondaryComponentManager = std::make_unique<CComponentManager>(*m_SecondaryContext, scriptInterface.GetContext());
 		m_SecondaryComponentManager->LoadComponentTypes();
Index: source/simulation2/system/SimContext.h
===================================================================
--- source/simulation2/system/SimContext.h
+++ source/simulation2/system/SimContext.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2016 Wildfire Games.
+/* Copyright (C) 2024 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -32,7 +32,7 @@
 class CSimContext
 {
 public:
-	CSimContext();
+	CSimContext(CTerrain* terrain = nullptr, CUnitManager* unitManager = nullptr);
 	~CSimContext();
 
 	CComponentManager& GetComponentManager() const;
@@ -55,13 +55,11 @@
 	int GetCurrentDisplayedPlayer() const;
 
 private:
-	CComponentManager* m_ComponentManager;
+	CComponentManager* m_ComponentManager{nullptr};
 	CUnitManager* m_UnitManager;
 	CTerrain* m_Terrain;
 
 	CEntityHandle m_SystemEntity;
-
-	friend class CSimulation2Impl;
 };
 
 #endif // INCLUDED_SIMCONTEXT
Index: source/simulation2/system/SimContext.cpp
===================================================================
--- source/simulation2/system/SimContext.cpp
+++ source/simulation2/system/SimContext.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 2016 Wildfire Games.
+/* Copyright (C) 2024 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -23,8 +23,9 @@
 
 #include "ps/Game.h"
 
-CSimContext::CSimContext() :
-	m_ComponentManager(NULL), m_UnitManager(NULL), m_Terrain(NULL)
+CSimContext::CSimContext(CTerrain* terrain /*= nullptr*/, CUnitManager* unitManager /*= nullptr*/) :
+	m_UnitManager{unitManager},
+	m_Terrain{terrain}
 {
 }