Can't change material of (large) landscape

Development World Creation
,
1

Hi! I’m working on a project with a large landscape (32x32km) I managed to import the heightmaps piece by piece (4033x4033) and bought a content pack with an auto material. I tested this material on a small map and it is working fine but when I try to change the standard grass material of my large map nothing happens… In the Landscape painting mode in the layers tab the L_Ground_LayerInfo layer is marked with a questionmark. To rule out a mistake I tried to change the material to a StarterContent material but this also didn’t work… Do I have to somehow manually reload the textures or is there a log where I could check what is missing?

Engine Version: 5.1.1
OS: Manjaro Linux
CPU: Ryzen 9 5950X
GPU: RTX 3080ti
RAM: 128GB

2

Addendum: I can change the material of single landscape actors, but it would obviously be a big efford to change them all one by one.

3

I still couldn’t find a solution for this problem, does anyone have a clue? Is there a way to force reload of the materials of the landscape actor?