Landscape layers problem

I came across a problem with landscape layers. At first I didn’t pay attention to it, but after adding water I realized that all transparent objects become black on the landscape. The landscape material itself is black, but its layers are normal for some reason.




I don’t know if I should pay attention to this, but I transfered this landscape MAT from another project and the whole landscape was black, but when I started painting it, it became normal.
It’s not hard for me to make new landscape, but I would like to know what causes this problem