Well it's obvious they are not, but those are blocks of simular kind so maybe have an option to apply leaves culling to roots too.

Shouldn't be hard to do, ill check. Not sure if I want to batch it together or not tho.
Vanilla has a weird culling check for roots

So it seems that in vanilla. Mangrove roots cull there top and bottom faces if next to more mangrove roots. Although no other faces are culled. I'll add an option to include them

Mangrove Roots support in: 4c5786b
Will be included in the next release

@FxMorin So, this breaks vanilla top and bottom culling next to mangrove roots forever? I think vanilla is more realistic. Could you add it back?

Theres a config option to disable mangrove root culling