I’m experiencing the same crash issue. I’m trying to load in 25 tiles (4033 x 4033 each) for a 20.165km x 20.165km map from World Creator 2… with “Enable Edit Layers” selected too. UE4 (4.26) creates a single landscape actor for all tiles (levels). When attempting to edit the landscape (make simple sculpting changes with 3 or 4 of the tiles loaded, it crashes with the error:
Assertion failed: SizeX <= GetMax2DTextureDimension() [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Texture.cpp] [Line: 570] Requested texture2d x size too large: 32768, 16384
It sometimes deletes the landscape actor in the crash process and I haven’t been able to figure out yet how to recreate it without deleting all the tiles and reimporting the heightmaps… frustrating and preventing progress on my project.