Fix play mode runtime scene replacement

engine/src/Scripting/ScriptEngine.cpp

@@ -141,6 +141,54 @@ void ScriptEngine::OnRuntimeStop() {
     m_runtime->OnRuntimeStop(stoppedScene);
 }
 
+void ScriptEngine::OnRuntimeSceneReplaced(Components::Scene* scene) {
+    if (!m_runtimeRunning) {
+        m_runtimeScene = nullptr;
+        m_runtimeSceneCreatedSubscription = 0;
+        m_scriptStates.clear();
+        m_scriptOrder.clear();
+        return;
+    }
+
+    const float configuredFixedDeltaTime = m_runtimeFixedDeltaTime;
+    m_runtime->OnRuntimeStop(nullptr);
+    m_runtimeFixedDeltaTime = configuredFixedDeltaTime;
+
+    m_runtimeScene = scene;
+    m_runtimeSceneCreatedSubscription = 0;
+    m_scriptStates.clear();
+    m_scriptOrder.clear();
+
+    if (!m_runtimeScene) {
+        return;
+    }
+
+    m_runtime->OnRuntimeStart(m_runtimeScene);
+    m_runtimeSceneCreatedSubscription = m_runtimeScene->OnGameObjectCreated().Subscribe(
+        [this](Components::GameObject* gameObject) {
+            HandleGameObjectCreated(gameObject);
+        });
+
+    for (Components::GameObject* root : m_runtimeScene->GetRootGameObjects()) {
+        CollectScriptComponents(root);
+    }
+
+    const std::vector<ScriptInstanceKey> startupKeys = m_scriptOrder;
+    for (const ScriptInstanceKey& key : startupKeys) {
+        auto it = m_scriptStates.find(key);
+        if (it == m_scriptStates.end()) {
+            continue;
+        }
+
+        ScriptInstanceState& state = it->second;
+        if (!ShouldScriptRun(state)) {
+            continue;
+        }
+
+        EnsureScriptReady(state, true);
+    }
+}
+
 void ScriptEngine::OnFixedUpdate(float fixedDeltaTime) {
     if (!m_runtimeRunning) {
         return;