occlusion culling union support

so for my map i use these unions as the ground parts of the map


so as you can see you can only see the ground with grass (union) and a few trees and rocks (+water)
whenever i press wireframe rendering you can see that everything behind it still gets rendered:

Expected behavior

however when i separate the parts, i do get the regular occlusion culling back

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it is still occuring and happens on all files

occlusion culling repro.rbxl (62.5 KB)
turn on wireframe rendering and put your camera behind the wall, you will see that behind the union everything still ‘renders’ but it doesnt behind the regular part