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A light build on a folliage will brighten the area outside the light's influence.

A light build on a folliage will brighten the area outside the light’s influence.
The red area in the figure is outside the range of the light blue point light,
and there should be no factor to make it brighter, but it is illuminated by the light blue light.

This kind of phenomenon is happening all over the map,
but why does it happen that the lightmap texture is shared?