Steps to Reproduce

1) Create a landscape with 2x2 subsections

2) Select the landscape, and in the details panel, change "Collision Mip Level" to 1 or "Simple Collision Mip Level" to 2

 

Callstack
Assertion failed: CollisionSizeVerts * StepSize == SizeVerts [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeEdit.cpp] [Line: 1814]
UnrealEditor_Landscape!ULandscapeComponent::UpdateCollisionPhysicalMaterialData() [D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeEdit.cpp:1814]
UnrealEditor_Landscape!ULandscapeComponent::UpdatePhysicalMaterialTasks() [D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeEdit.cpp:1768]
UnrealEditor_Landscape!ALandscapeProxy::UpdatePhysicalMaterialTasks() [D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\Landscape.cpp:5198]
UnrealEditor_Landscape!ULandscapeSubsystem::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeSubsystem.cpp:173]
UnrealEditor_Engine!FTickableGameObject::TickObjects() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Tickable.cpp:153]
UnrealEditor_Engine!UWorld::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp:1606]
UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1680]
UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:517]
UnrealEditor!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5369]
UnrealEditor!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:202]
UnrealEditor!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:107]
UnrealEditor!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:244]
UnrealEditor!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:282]
UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]

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Fixed
Fix Commit31635330
Main Commit31635330
CreatedMar 21, 2023
ResolvedFeb 20, 2024
UpdatedApr 16, 2024