All roads are indeed 8x8m so scaling them down will result in them being smaller than grid size. but of they are small to begin with then I'll check it out. What engine are you using? In Godot they seem to be 8 grid units
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I use godot. What's basically going on is that the roads are uniformly scaled when imported, but some of them have a transform of 0.8 on them, so when I load them into a meshlibrary for a gridmap they are no longer scaled correctly. I've noticed it specifically on the glb files in the road type 1 folder.