Нету такой перменной !
Всё что нашёл:
# Optional - enable smooth lighting by default on all maps supporting it (can be set per map as lighting option)
smooth-lighting: true
# Default image format for HDMaps (png, jpg, jpg-q75, jpg-q80, jpg-q85, jpg-q90, jpg-q95, jpg-q100)
# Has no effect on maps with explicit format settings
image-format: png
# use-generated-textures: if true, use generated textures (same as client); false is static water/lava textures
# correct-water-lighting: if true, use corrected water lighting (same as client); false is legacy water (darker)
# transparent-leaves: if true, leaves are transparent (lighting-wise): false is needed for some Spout versions that break lighting on leaf blocks
use-generated-textures: true
correct-water-lighting: true
transparent-leaves: true