Dirt tiles (dirt-on-transparent) must be applied to DIRT tiles checking
for non-dirt neighbors, not to GRASS tiles. The previous approach had
dirt edges facing the wrong direction because the dirt island's edges
point inward from the center, not outward from the grass.
Water edges (watergrass = grass-on-water) remain applied to GRASS tiles
since the grass portion aligns correctly with the base grass layer.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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