ive tried to make this multipar when ik place its just fine but when i place a other multipart in the same block i can walk through it

package com.DenBukki.FarmLandCover;

import java.util.List;

import net.minecraft.block.Block;
import net.minecraft.util.AxisAlignedBB;
import codechicken.lib.vec.Cuboid6;
import codechicken.multipart.minecraft.McMetaPart;

public class BlockFarmlandCoverPart extends McMetaPart {

@Override
public String getType() {
	return "BlockFarmlandCover";
}

@Override
public Cuboid6 getBounds() {
	return new Cuboid6(0.0, 0.875, 0.0, 1.0, 0.9375, 1.0);
}

@Override
public Block getBlock() {
	return FarmlandCover.BlockFarmlandCover;
}

    
}

Override

public Iterable<Cuboid6> getCollisionBoxes()

to return a ArrayList of the Cuboid6 given at

getBounds()

.