[=.Wenograd;616198]
Try setting the distance field resolution of grass/foliage to 0, or disable the “Affects distance field lighting” option in the foliage painter.
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“Affects distance field lighting” is already disabled. But still some weird shadowing happens when skylight is stationary. It even kills the specularity due to specular occlusion. It get’s fixed only when DFAO is disabled using the command line or by unchecking Generate mesh distance fields.