It's not really a bug, just a detail that I've been noticing for a while, but it might go unnoticed by most people.

Unlike other tiles, the gray pattern not complete itself (yes, I am aware that to form a pattern, it is necessary to change positions). Also, to form a pattern on the white, instead of rotating clockwise, I need to do the opposite of most tiles.

The print I'm sending isn't really a reference, since I purposely left an arrow pointing up and another pointing down, but I think it is possible to notice even so that the pattern would not form even trying (just use circles as a base instead of arrows and diamonds).

Ultimately, if a drawing is formed at one point, another drawing next to it will be incomplete…