Landscape Pro 2.0 Auto-Generated Material, Square auto painting

Hi all,
I’m having problems using landscape painting, for some reason any layer I use, the paint spreads across the square section. This project is working in 4.26 fine.
But now in v5.01, I came across this problem. For context, Lumen and WorldPartition are not enabled and these Landscape materials are "Landscape Pro 2.0 Auto-Generated Material - from STF3d "


Any ideas on what could be wrong?
Thanks for the help

any luck ? Im trying this same auto material by stf, and after creating instance as in op video, and dragging onto material slot on ‘landscape’ of world partition world but streaming disabled, the rocksand material I had assigned, remains, so new mat isn’t doing anything, did you ever have this issue ?

If not hope someone has some idea.

thx\