After testing the new 5.4.0 release this problem still persists.
Unless I am missing something this essentially makes landscape nanite displacement only an additive process (other than manual landscape painting) - meaning different displacement textures of similar heights or lower heights cannot be projected over one another. For example dips / holes / puddles cannot be projected onto the displacement of the landscape (there are many such textures that would be suitable for this within the Megascans library).
This would seem to be a big missed opportunity from a technical art perspective.
I noticed this too, for some reason the same project files with the same settings have much lower framerates in 5.4 compared to 5.2 or 5.3. I’ve experienced a full 25fps drop so far.
Unreal 5.4.1 completly fails to work on my computer.
When I run it from Launcher - nothing happen - any splash screen, nothing.
When I run it manually UnrealEditor.exe - nothing happen. In Task Manager I see UnrealEditor task for 2-3 seconds and it disappear.
So I create in UE 5.3.2 empty project. Open Visual Studio 2022, and run debugger with result of Unhandled exception (showed in screenshot) in function:
FWindowsPlatformMisc::GetFeatureBits_X86()
My computer is:
Notebook DTR:
Hyperbook GTR - Clevo X170KM-G
Windows 10 Pro - 10.0.19042 Compilation 19042
x64-based PC
CPU 11th Gen Intel Core i7-11700K, 3.60Ghz, 3600 Mhz, 8 cores, logic 16
BIOS: INSYDE Corp. 1.07.04, 11.01.2020
SMBIOS 3.3
Motherboard X170KM-G, Intel Z590 (Rocket Lake PCH-H)
64 GB DDR4 SDRAM
NVIDIA GeForce RTX 3080 Laptop, 16 GB GDDR6 SDRAM, 256-bit
HDD Samsung SSD 970 EVO Plus 2TB
So computer is really fast, and I don’t have any problem with really big Unreal projects on it (UE 4.25 to UE 5.3.2).
Anyone know what’s wrong? UE 5.3 and earlier works fine.
I try to solve problem with proposed by Epic solution:
In the Visual Studio 2022 installer, install the “MSVC v143 - VS 2022 C++ x64/x86 build tools (v14.38-17.8)”
Also upgrade VS 2022, restart computer, again, clean temp folders of project, rebuild, nad run with debug with different issue.
This time I have Unhandled exception in line: if (CheckFeatureBit_X86(ECPUFeatureBits_X86::SSE42) == false)
inside function: void FWindowsPlatformMisc::PlatformPreInit()
Again in screenshot is callstack and exception line. Editor do not launch at all.
You can track the bug progression once it goes public 
