I fixed it myself by opening up that file in paint (was 31x31 pixels) and editing image properties to force it to be 32x32 pixels.
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The given sprite rectangle (left_top=0x0, right_bottom=32x32) is outside the actual sprite size (left_top=0x0, right_bottom=31x31).
Sprite name: __base__/graphics/decorative/garballo/.: __base__/graphics/decorative/garballo/garballo-06.png