https://docs.unity3d.com/ru/2019.2/ScriptReference/SceneManagement.SceneManager.UnloadScene.html
SceneManagement.SceneManager-UnloadScene - Unity Scripting API
Destroys all GameObjects associated with the given Scene and removes the Scene from the SceneManager.
unityscriptingapi
https://issuetracker.unity3d.com/issues/scenemanager-dot-unloadscene-crashes-at-atomicstack-pop
Unity Issue Tracker - SceneManager.UnloadScene crashes at Coroutine::CleanupCoroutine
Steps to reproduce: 1. Open attached project2. Open scene "splash"3. Run it4. Unity hangs. Open editor.log shows stacktrace starting...
issue trackerunitycrashescoroutine