Occisonal random chunks get borked. the map and resource pack is The Kitatcho Laboratories 1

i submitted too soon. i tried multiple diffrent settings and most didnt change it other then changing the mode.
operating specs

Is there a lot of light sources nearby that area? Lights are stored in bins/lists for every 8x8x8 region of blocks.

You can try increasing the "Max Bin Lights" count under Lighting > Trace Options > Advanced
Or try increasing the "Max Sample Count" under Lighting > Trace Options