Unreal Engine Issues and Bug Tracker (UE-219393)

Description

A crash occurs when LevelInstance with LevelBehavior set to "Standalone" is loaded in a standalone game. Specifically, when LevelInstance is deleted by moving outside the loading range of the worldpartition, and then moved back inside the loading range to create a new LevelInstance, a crash occurs.

Steps to Reproduce

Open the sample project refer to the additional link
Play in the standalone game in editor
Move Character away from the level instance and confirm that the level instance is unloaded
Move to the loading range to return to the starting point to load the level instance again

Callstack

LoginId:a28409704427cc781fafa5b458893007
EpicAccountId:fb567da00f03436dabdb32db92746435Assertion failed: !StreamingPolicy [File:D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartitionStreamingGeneration.cpp] [Line: 1912]UnrealEditor_Engine!`UWorldPartition::GenerateContainerStreaming'::`2'::<lambda_4>::operator()() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartitionStreamingGeneration.cpp:1912]
UnrealEditor_Engine!UWorldPartition::GenerateContainerStreaming() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartitionStreamingGeneration.cpp:1960]
UnrealEditor_Engine!UWorldPartition::GenerateStreaming() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartitionStreamingGeneration.cpp:1846]
UnrealEditor_Engine!UWorldPartition::OnBeginPlay() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartition.cpp:432]
UnrealEditor_Engine!UWorldPartition::Initialize() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartition.cpp:703]
UnrealEditor_Engine!UWorldPartitionSubsystem::OnLevelBeginMakingVisible() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartitionSubsystem.cpp:652]
UnrealEditor_Engine!TBaseUObjectMethodDelegateInstance<0,UWorldPartitionSubsystem,void __cdecl(UWorld *,ULevelStreaming const *,ULevel *),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:667]
UnrealEditor_Engine!TMulticastDelegate<void __cdecl(UWorld *,ULevelStreaming const *,ULevel *),FDefaultDelegateUserPolicy>::Broadcast() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Core\Public\Delegates\DelegateSignatureImpl.inl:956]
UnrealEditor_Engine!UWorld::AddToWorld() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\World.cpp:3187]
UnrealEditor_Engine!ULevelStreaming::UpdateStreamingState() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\LevelStreaming.cpp:995]
UnrealEditor_Engine!UWorld::UpdateLevelStreaming() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\World.cpp:4327]
UnrealEditor_Engine!UGameViewportClient::Draw() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\GameViewportClient.cpp:1757]
UnrealEditor_Engine!FViewport::Draw() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\UnrealClient.cpp:1754]
UnrealEditor_Engine!UGameEngine::RedrawViewports() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\GameEngine.cpp:736]
UnrealEditor_Engine!UGameEngine::Tick() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Engine\Private\GameEngine.cpp:1907]
UnrealEditor!FEngineLoop::Tick() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5921]
UnrealEditor!GuardedMain() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Launch\Private\Launch.cpp:180]
UnrealEditor!GuardedMainWrapper() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
UnrealEditor!LaunchWindowsStartup() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
UnrealEditor!WinMain() [D:\Github\UnrealEngine-5.4.2-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Unresolved

Component	UE - World Creation - Worldbuilding Tools - Level Instances
Affects Versions	5.4
Target Fix	5.6

Created	Jul 16, 2024
Updated	Aug 21, 2024

View Jira Issue

UE-219393

Crash when load the levelinstance what is set "LevelBehavior=Standalone" in the stanadalone game

Crash when load the levelinstance what is set "LevelBehavior=Standalone" in the stanadalone game

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