Also, the transition between the terrain textures and the terrain transition textures seems to be slightly offset in all cases.
lowland-dead-skin.png
has a one-pixel-high orange stripe at the bottom row of the water transition textures.In game:

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lowland-dead-skin-2.png
has a one-pixel-high green stripe at the bottom row of the water transition textures.In game:

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pit-rock.png
has a one-pixel-wide strip of light gray in almost all tiles, which appears in almost all water transition textures.In game:

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