Description

In 4.27.2 a new cluster is created without any problem.

Steps to Reproduce

1. Open CrashTest_Main.umap in the attached project

2. Drag and drop the sub-level Actor into the HLOD outliner following the instructions in the attached video

Callstack

Assertion failed: NewCluster != nullptr [Link Removed] [Line: 836] Failed to create a new cluster

UnrealEditor_HierarchicalLODUtilities!FHierarchicalLODUtilities::CreateNewClusterFromActors() [D:\P4\UE5main\Engine\Source\Developer\HierarchicalLODUtilities\Private\HierarchicalLODUtilities.cpp:836]
UnrealEditor_HierarchicalLODOutliner!HLODOutliner::FLODLevelDropTarget::CreateNewCluster() [D:\P4\UE5main\Engine\Source\Editor\HierarchicalLODOutliner\Private\LODLevelItem.cpp:201]
UnrealEditor_HierarchicalLODOutliner!HLODOutliner::FLODLevelItem::OnDrop() [D:\P4\UE5main\Engine\Source\Editor\HierarchicalLODOutliner\Private\LODLevelItem.cpp:85]
UnrealEditor_HierarchicalLODOutliner!HLODOutliner::HandleDrop() [D:\P4\UE5main\Engine\Source\Editor\HierarchicalLODOutliner\Private\HLODTreeWidgetItem.cpp:159]
UnrealEditor_HierarchicalLODOutliner!HLODOutliner::SHLODWidgetItem::OnDrop() [D:\P4\UE5main\Engine\Source\Editor\HierarchicalLODOutliner\Private\HLODTreeWidgetItem.cpp:314]
UnrealEditor_Slate!<lambda_471858b7e70a8b68bd65bc435c2a047c>::operator()() [D:\P4\UE5main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5082]
UnrealEditor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_471858b7e70a8b68bd65bc435c2a047c> >() [D:\P4\UE5main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:406]
UnrealEditor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\P4\UE5main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5077]
UnrealEditor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\P4\UE5main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5595]
UnrealEditor_Slate!FSlateApplication::OnMouseUp() [D:\P4\UE5main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5560]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\P4\UE5main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2220]
UnrealEditor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\P4\UE5main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2727]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\P4\UE5main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1896]
UnrealEditor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\P4\UE5main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:926]

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Unresolved
ComponentUE - LD & Art - World Building - HLOD
Affects Versions5.0.3
Target Fix5.2
CreatedAug 25, 2022
UpdatedAug 31, 2022