Your method is create a seamless tile, duplicate it by a set distance etc? That leads to mistakes. Just create a shape of any size and fill it with a single repeating tile, set it to the required dpi (96 say) is so much easier and foolproof. Why make more work for yourself? And all for 6Kb's.
This is why I can't follow the quest for a larger repeating seamless tile.
One seamless tile
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