plz help! UE5 Landscape HLOD builder error in the World Partition Level

Hello. I have been struggling with generating Landscape HLOD for the World Partition level in Unreal 5.
I know there aren’t much information about the new system but I really need some help.

All other actor in the level are successfully processed but the landscape proxies. :smiling_face_with_tear:
After multiple tests, I’ve come to the following conclusion.

  1. Issue is related to the Landscape Material - Blending Layers
  2. In Landscape mode, the Sculpt mode creates no problem, but the Paint mode using layers does.
  3. I tracked down the error log and the crashing point is related to the Weight map and layer hash- Something to do with the blending option in the Landscape material.
  4. My initial material blending mode was composed of multiple alpha blending and one weight blending. Played around with the blending options but had no luck.

This is the HLOD build log ----------------------------------------------------------------------

[2022.06.20-05.42.43:536][ 0]LogWindows: Error: === Critical error: ===
[2022.06.20-05.42.43:536][ 0]LogWindows: Error:
[2022.06.20-05.42.43:536][ 0]LogWindows: Error: Fatal error!
[2022.06.20-05.42.43:536][ 0]LogWindows: Error:
[2022.06.20-05.42.43:536][ 0]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff
[2022.06.20-05.42.43:536][ 0]LogWindows: Error:
[2022.06.20-05.42.43:536][ 0]LogWindows: Error: [Callstack] 0x00007fff47aadcdc UnrealEditor-Core.dll!_mi_heap_malloc_zero() [C:\project\Moon\main\UE5\Engine\Source\ThirdParty\mimalloc\src\alloc.c:147]
[2022.06.20-05.42.43:537][ 0]LogWindows: Error: [Callstack] 0x00007fff47ab524b UnrealEditor-Core.dll!mi_heap_malloc_zero_aligned_at() [C:\project\Moon\main\UE5\Engine\Source\ThirdParty\mimalloc\src\alloc-aligned.c:47]
[2022.06.20-05.42.43:537][ 0]LogWindows: Error: [Callstack] 0x00007fff47ab8b2e UnrealEditor-Core.dll!mi_realloc_aligned() [C:\project\Moon\main\UE5\Engine\Source\ThirdParty\mimalloc\src\alloc-aligned.c:187]
[2022.06.20-05.42.43:537][ 0]LogWindows: Error: [Callstack] 0x00007fff4750e757 UnrealEditor-Core.dll!FMallocMimalloc::Realloc() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Core\Private\HAL\MallocMimalloc.cpp:129]
[2022.06.20-05.42.43:538][ 0]LogWindows: Error: [Callstack] 0x00007fff4750eb13 UnrealEditor-Core.dll!FMemory::Realloc() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Core\Public\HAL\FMemory.inl:56]
[2022.06.20-05.42.43:538][ 0]LogWindows: Error: [Callstack] 0x00007fff3eaba3ea UnrealEditor-Landscape.dll!TArray<unsigned char,TSizedDefaultAllocator<32> >::ResizeGrow() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Core\Public\Containers\Array.h:2782]
[2022.06.20-05.42.43:538][ 0]LogWindows: Error: [Callstack] 0x00007fff3eb42e8e UnrealEditor-Landscape.dll!ULandscapeComponent::ComputeLayerHash() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Landscape\Private\LandscapeEditLayers.cpp:8773]
[2022.06.20-05.42.43:538][ 0]LogWindows: Error: [Callstack] 0x00007fff3ebeb116 UnrealEditor-Landscape.dll!ULandscapeHLODBuilder::ComputeHLODHash() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Landscape\Private\LandscapeHLODBuilder.cpp:76]
[2022.06.20-05.42.43:539][ 0]LogWindows: Error: [Callstack] 0x00007fff44927780 UnrealEditor-Engine.dll!UHLODBuilder::ComputeHLODHash() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Engine\Private\WorldPartition\HLOD\HLODBuilder.cpp:127]
[2022.06.20-05.42.43:539][ 0]LogWindows: Error: [Callstack] 0x00007fff1862b7b3 UnrealEditor-WorldPartitionHLODUtilities.dll!ComputeHLODHash() [P:\Workspace\Kidon_Moon_Main\UE5\Engine\Plugins\Editor\WorldPartitionHLODUtilities\Source\Private\WorldPartitionHLODUtilities.cpp:94]
[2022.06.20-05.42.43:540][ 0]LogWindows: Error: [Callstack] 0x00007fff1862affe UnrealEditor-WorldPartitionHLODUtilities.dll!FWorldPartitionHLODUtilities::BuildHLOD() [P:\Workspace\Kidon_Moon_Main\UE5\Engine\Plugins\Editor\WorldPartitionHLODUtilities\Source\Private\WorldPartitionHLODUtilities.cpp:351]
[2022.06.20-05.42.43:540][ 0]LogWindows: Error: [Callstack] 0x00007fff448b54f1 UnrealEditor-Engine.dll!AWorldPartitionHLOD::BuildHLOD() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Engine\Private\WorldPartition\HLOD\HLODActor.cpp:198]
[2022.06.20-05.42.43:540][ 0]LogWindows: Error: [Callstack] 0x00007fff401db73c UnrealEditor-UnrealEd.dll!UWorldPartitionHLODsBuilder::BuildHLODActors() [C:\project\Moon\main\UE5\Engine\Source\Editor\UnrealEd\Private\WorldPartition\WorldPartitionHLODsBuilder.cpp:479]
[2022.06.20-05.42.43:607][ 0]LogWindows: Error: [Callstack] 0x00007fff40215096 UnrealEditor-UnrealEd.dll!UWorldPartitionHLODsBuilder::RunInternal() [C:\project\Moon\main\UE5\Engine\Source\Editor\UnrealEd\Private\WorldPartition\WorldPartitionHLODsBuilder.cpp:305]
[2022.06.20-05.42.43:608][ 0]LogWindows: Error: [Callstack] 0x00007fff402139a4 UnrealEditor-UnrealEd.dll!UWorldPartitionBuilder::Run() [C:\project\Moon\main\UE5\Engine\Source\Editor\UnrealEd\Private\WorldPartition\WorldPartitionBuilder.cpp:277]
[2022.06.20-05.42.43:608][ 0]LogWindows: Error: [Callstack] 0x00007fff40214848 UnrealEditor-UnrealEd.dll!UWorldPartitionBuilder::RunBuilder() [C:\project\Moon\main\UE5\Engine\Source\Editor\UnrealEd\Private\WorldPartition\WorldPartitionBuilder.cpp:87]
[2022.06.20-05.42.43:609][ 0]LogWindows: Error: [Callstack] 0x00007fff3f581c0e UnrealEditor-UnrealEd.dll!UWorldPartitionBuilderCommandlet::Main() [C:\project\Moon\main\UE5\Engine\Source\Editor\UnrealEd\Private\Commandlets\WorldPartitionBuilderCommandlet.cpp:101]
[2022.06.20-05.42.43:609][ 0]LogWindows: Error: [Callstack] 0x00007ff62ca2948e UnrealEditor.exe!FEngineLoop::PreInitPostStartupScreen() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:3659]
[2022.06.20-05.42.43:609][ 0]LogWindows: Error: [Callstack] 0x00007ff62ca20bbd UnrealEditor.exe!GuardedMain() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Launch\Private\Launch.cpp:137]
[2022.06.20-05.42.43:610][ 0]LogWindows: Error: [Callstack] 0x00007ff62ca20e8a UnrealEditor.exe!GuardedMainWrapper() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
[2022.06.20-05.42.43:610][ 0]LogWindows: Error: [Callstack] 0x00007ff62ca23c4d UnrealEditor.exe!LaunchWindowsStartup() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
[2022.06.20-05.42.43:610][ 0]LogWindows: Error: [Callstack] 0x00007ff62ca35534 UnrealEditor.exe!WinMain() [C:\project\Moon\main\UE5\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
[2022.06.20-05.42.43:610][ 0]LogWindows: Error: [Callstack] 0x00007ff62ca386e6 UnrealEditor.exe!__scrt_common_main_seh() [d:\a01_work\12\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[2022.06.20-05.42.43:611][ 0]LogWindows: Error: [Callstack] 0x00007ff804b454e0 KERNEL32.DLL!UnknownFunction []
[2022.06.20-05.42.43:611][ 0]LogWindows: Error: [Callstack] 0x00007ff805d8485b ntdll.dll!UnknownFunction []
[2022.06.20-05.42.43:612][ 0]LogWindows: Error: