The Landscape tools cause the program to crash on MacOS M series chip with Unreal Engine 5.4.

[GolemNick1 (GolemNick)]

I was struggling with this issue as well - then found another post:

Unreal Engine Crashing When Flattening

I have the same issue. Unreal 5.4.1 with Macbook M3 Max. I found that some tools (like flatten and smooth) have a setting called “Combined layers operation”. Disabling this fixed the issue and is not resulting in an immediate crash. Same computer with Unreal Version 5.3 is not causing the issue. It is most likely a bug in version 5.4.1

Disabling the combined layers option seemed to fix the issue for me!