GPU Lightmass crash on 5.1.1

Hello, getting a crash on GPU Lightmass 5.1.1 when building the lights :

Assertion failed: InStateBucketId < ((1 << 14) - 1) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\Nanite\NaniteMaterials.h] [Line: 34]

UnrealEditor_Renderer!FNaniteDrawListContext::Apply() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\Nanite\NaniteDrawList.cpp:224]
UnrealEditor_Renderer!FPrimitiveSceneInfo::CacheNaniteDrawCommands() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\PrimitiveSceneInfo.cpp:573]
UnrealEditor_Renderer!FPrimitiveSceneInfo::AddStaticMeshes() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\PrimitiveSceneInfo.cpp:1121]
UnrealEditor_Renderer!FPrimitiveSceneInfo::AddToScene() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\PrimitiveSceneInfo.cpp:1409]
UnrealEditor_Renderer!FScene::UpdateAllPrimitiveSceneInfos() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\RendererScene.cpp:5671]
UnrealEditor_Engine!FSceneInterface::UpdateAllPrimitiveSceneInfos() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\SceneInterface.cpp:15]
UnrealEditor_Engine!<lambda_629b2668e274e1a6fcf19e4edd1b6dcb>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\Components\ActorComponent.cpp:174]
UnrealEditor_Engine!TEnqueueUniqueRenderCommandType<UpdateAllPrimitiveSceneInfosForScenes'::5’::UpdateAllPrimitiveSceneInfosCmdName,<lambda_629b2668e274e1a6fcf19e4edd1b6dcb> >::DoTask() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Public\RenderingThread.h:206]
UnrealEditor_Engine!TGraphTask<TEnqueueUniqueRenderCommandType<UpdateAllPrimitiveSceneInfosForScenes'::5’::UpdateAllPrimitiveSceneInfosCmdName,<lambda_629b2668e274e1a6fcf19e4edd1b6dcb> > >::ExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:1349]
UnrealEditor_Core!FNamedTaskThread::ProcessTasksNamedThread() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:760]
UnrealEditor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:649]
UnrealEditor_RenderCore!RenderingThreadMain() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:415]
UnrealEditor_RenderCore!FRenderingThread::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:541]
UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:149]