This is a regression as it does not happen in //UE5/Release-5.1.1
Expected Results: Landscape will be added on to without issues
Actual Results: After adding a few large sections to the landscape the Editor will hang for a few minutes and then crash. When reopening the Editor these strange lines appear on the grid.
UnrealEditor-D3D12RHI!FD3D12DynamicRHI::GetResourceDesc(FRHITextureDesc const &) [D3D12Texture.cpp:534]UnrealEditor-D3D12RHI!FD3D12DynamicRHI::CreateD3D12Texture(FRHITextureCreateDesc const &,FRHICommandListImmediate *,ID3D12ResourceAllocator *) [D3D12Texture.cpp:845]UnrealEditor-D3D12RHI!FD3D12DynamicRHI::RHICreateTexture_RenderThread(FRHICommandListImmediate &,FRHITextureCreateDesc const &) [D3D12Texture.cpp:960]UnrealEditor-Engine!FTextureRenderTarget2DResource::InitDynamicRHI() [TextureRenderTarget2D.cpp:634]UnrealEditor-RenderCore!7ffb660a0000 + 1ff633UnrealEditor-Engine!static void TEnqueueUniqueRenderCommandType<`UTextureRenderTarget2D::ResizeTarget'::`11'::ResizeRenderTargetName,<lambda_dc6125b1fd85689a15226ede4c0596b2> >::DoTask(ENamedThreads::Type, const class TRefCountPtr<FGraphEvent> & const) [RenderingThread.h:209]UnrealEditor-Engine!static void TGraphTask<TEnqueueUniqueRenderCommandType<`UTextureRenderTarget2D::ResizeTarget'::`11'::ResizeRenderTargetName,<lambda_dc6125b1fd85689a15226ede4c0596b2> > >::ExecuteTask(class TArray<FBaseGraphTask *,TSizedDefaultAllocator<32> > & const, ENamedThreads::Type, bool) [TaskGraphInterfaces.h:1310]UnrealEditor-Core!FNamedTaskThread::ProcessTasksNamedThread(int,bool) [TaskGraph.cpp:758]UnrealEditor-Core!FNamedTaskThread::ProcessTasksUntilQuit(int) [TaskGraph.cpp:649]UnrealEditor-RenderCore!7ffb660a0000 + 16bd89UnrealEditor-RenderCore!7ffb660a0000 + 171cf4UnrealEditor-Core!FRunnableThreadWin::Run() [WindowsRunnableThread.cpp:149]UnrealEditor-Core!FRunnableThreadWin::GuardedRun() [WindowsRunnableThread.cpp:79]KERNEL32!7ffc207b0000 + 17614ntdll!7ffc22750000 + 526a1
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-188179 in the post.