To reproduce:
1) Create new project
2) Create material in project view
3) Change Rendering mode to "Cutout" or "Transparent"
4) Add a texture to Diffuse slot(Default-Particle Texture2D works perfectly)
5) Create plane and cube, pull out cube a bit and make sure it throws good shadow(should be okay in default settings)
6) Add material to cube, notice the shadow changes
7) Change material's tiling to something noticeable like 10x1, notice that the shadow remains same as 1x1

Note: Only happens when light is baked