src/game/java/net/minecraft/world/item/DoubleHighBlockItem.java

package net.minecraft.world.item;

import net.minecraft.core.BlockPos;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;

public class DoubleHighBlockItem extends BlockItem {
    public DoubleHighBlockItem(Block p_41010_, Item.Properties p_41011_) {
        super(p_41010_, p_41011_);
    }

    @Override
    protected boolean placeBlock(BlockPlaceContext p_41013_, BlockState p_41014_) {
        Level level = p_41013_.getLevel();
        BlockPos blockpos = p_41013_.getClickedPos().above();
        BlockState blockstate = level.isWaterAt(blockpos) ? Blocks.WATER.defaultBlockState() : Blocks.AIR.defaultBlockState();
        level.setBlock(blockpos, blockstate, 27);
        return super.placeBlock(p_41013_, p_41014_);
    }
}