Foilage broken...

In Unreal 5.3, I created a scene that contains a lot of foilage, that was imported from Quixel, and it shows well over the distance, with full detail:

After I migrated the project to 5.7, foilage is broken: Less detail (I guess LOD kicked in) and in the distance, it’s just a placeholder:

I zipped the original 5.3 project and moved it off the disk for space, but when I encountered this, I restored it, but this problem occurred there too.
What I found is that a lot of materials in folder MSPresets - referred to by the materials in foilage - is missing information: For instance in M_MS_Billboard_Material OTS texture and Normal Texture are found to be NULL and a function, labelled “SSS” is unspecified:

Not just in the project I migrated to 5.7, but also in the original 5.3 project.
I re-installed the package but the error has not been corrected.
It’s no problem to correct it manually if only I knew what I should use