Not sure if this is an issue from your side or the other. I'll make an issue over there as well (although it's more annoying). Blocks placed with non-vanilla logic, anything that's sideways basically, do not get LODs from Distant Horizons. I'm not sure if this is an artifact of the placement logic doing something directly to the blocks, or if the blocks just aren't registered as blocks by Distant Horizons, like grass and flowers.

This mod seems to be compatible with almost everything under the sun, barring mods that do similar things with added blocks, like Copcat blocks for Create, so I figure it's probably a combination of both AP and DH.

Thanks. I'm a builder, so this mod is like crack cocaine for me. Keep on chucking cool stuff out <3

I'm unsure if this can be resolved, considering that the vertical slabs and such aren't the normal type of block that Distant Horizons is looking for. It might be better to make an issue on the Distant Horizons issues thing, but it also might just never work together.