I created a library on blender and assigned a simple shader that recreates the wood.
I did the UV Unwrapping of it with the automatic tool called "Smart UV Project".
As you can see the texture is in black and white and I don't understand why.
If I try to export the library and import it into Unity it appears completely clear and the wood shader is completely lost.
I have no idea what I am doing wrong.
I have the same problem with Blender 3.9 or Blender 4.0