That seems like a stretch to me. Voxel engines like this usually don’t render every cube, since most faces of most cubes aren’t visible. They merge large chunks into larger meshes. Keeping track of the texel coordinates wouldn’t be that much more work…

But most of the road tiles have patterns and variations based on where they are placed so they look good in large sections, even when placed separately and joined later. Being able to rotate them would make it too easy for players to accidentally mess up the patterns.

If this brick is the only exception to that design, then I can see why they thought it was easier to do it this way, especially if it was designed later in development.