Terrain Normal Map not showing in Build

I am currently working on a level and everything was fine until I started to build it. In the scene and game view inside Unity everything works, but in the Build I can’t see the normal map of the terrain layers.
Unity version is 2020.2.0f1
Target platform of the build is windows

I would be very grateful for any suggestions, because this is the final project for my bachelors degree, and I ran out of ideas how to fix the problem.