craftbukkit/nms-patches/net/minecraft/world/item/ItemBlock.patch

--- a/net/minecraft/world/item/ItemBlock.java
+++ b/net/minecraft/world/item/ItemBlock.java
@@ -32,6 +32,13 @@
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.phys.shapes.VoxelShapeCollision;
 
+// CraftBukkit start
+import net.minecraft.server.level.WorldServer;
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.event.block.BlockCanBuildEvent;
+// CraftBukkit end
+
 public class ItemBlock extends Item {
 
     /** @deprecated */
@@ -62,6 +69,12 @@
                 return EnumInteractionResult.FAIL;
             } else {
                 IBlockData iblockdata = this.getPlacementState(blockactioncontext1);
+                // CraftBukkit start - special case for handling block placement with water lilies and snow buckets
+                org.bukkit.block.BlockState blockstate = null;
+                if (this instanceof PlaceOnWaterBlockItem || this instanceof SolidBucketItem) {
+                    blockstate = org.bukkit.craftbukkit.block.CraftBlockStates.getBlockState(blockactioncontext1.getLevel(), blockactioncontext1.getClickedPos());
+                }
+                // CraftBukkit end
 
                 if (iblockdata == null) {
                     return EnumInteractionResult.FAIL;
@@ -79,6 +92,19 @@
                         this.updateCustomBlockEntityTag(blockposition, world, entityhuman, itemstack, iblockdata1);
                         updateBlockEntityComponents(world, blockposition, itemstack);
                         iblockdata1.getBlock().setPlacedBy(world, blockposition, iblockdata1, entityhuman, itemstack);
+                        // CraftBukkit start
+                        if (blockstate != null) {
+                            org.bukkit.event.block.BlockPlaceEvent placeEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent((WorldServer) world, entityhuman, blockactioncontext1.getHand(), blockstate, blockposition.getX(), blockposition.getY(), blockposition.getZ());
+                            if (placeEvent != null && (placeEvent.isCancelled() || !placeEvent.canBuild())) {
+                                blockstate.update(true, false);
+
+                                if (this instanceof SolidBucketItem) {
+                                    ((EntityPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-4541
+                                }
+                                return EnumInteractionResult.FAIL;
+                            }
+                        }
+                        // CraftBukkit end
                         if (entityhuman instanceof EntityPlayer) {
                             CriterionTriggers.PLACED_BLOCK.trigger((EntityPlayer) entityhuman, blockposition, itemstack);
                         }
@@ -86,7 +112,7 @@
 
                     SoundEffectType soundeffecttype = iblockdata1.getSoundType();
 
-                    world.playSound(entityhuman, blockposition, this.getPlaceSound(iblockdata1), SoundCategory.BLOCKS, (soundeffecttype.getVolume() + 1.0F) / 2.0F, soundeffecttype.getPitch() * 0.8F);
+                    // world.playSound(entityhuman, blockposition, this.getPlaceSound(iblockdata1), SoundCategory.BLOCKS, (soundeffecttype.getVolume() + 1.0F) / 2.0F, soundeffecttype.getPitch() * 0.8F);
                     world.gameEvent((Holder) GameEvent.BLOCK_PLACE, blockposition, GameEvent.a.of(entityhuman, iblockdata1));
                     itemstack.consume(1, entityhuman);
                     return EnumInteractionResult.SUCCESS;
@@ -144,8 +170,15 @@
     protected boolean canPlace(BlockActionContext blockactioncontext, IBlockData iblockdata) {
         EntityHuman entityhuman = blockactioncontext.getPlayer();
         VoxelShapeCollision voxelshapecollision = entityhuman == null ? VoxelShapeCollision.empty() : VoxelShapeCollision.of(entityhuman);
+        // CraftBukkit start - store default return
+        boolean defaultReturn = (!this.mustSurvive() || iblockdata.canSurvive(blockactioncontext.getLevel(), blockactioncontext.getClickedPos())) && blockactioncontext.getLevel().isUnobstructed(iblockdata, blockactioncontext.getClickedPos(), voxelshapecollision);
+        org.bukkit.entity.Player player = (blockactioncontext.getPlayer() instanceof EntityPlayer) ? (org.bukkit.entity.Player) blockactioncontext.getPlayer().getBukkitEntity() : null;
 
-        return (!this.mustSurvive() || iblockdata.canSurvive(blockactioncontext.getLevel(), blockactioncontext.getClickedPos())) && blockactioncontext.getLevel().isUnobstructed(iblockdata, blockactioncontext.getClickedPos(), voxelshapecollision);
+        BlockCanBuildEvent event = new BlockCanBuildEvent(CraftBlock.at(blockactioncontext.getLevel(), blockactioncontext.getClickedPos()), player, CraftBlockData.fromData(iblockdata), defaultReturn);
+        blockactioncontext.getLevel().getCraftServer().getPluginManager().callEvent(event);
+
+        return event.isBuildable();
+        // CraftBukkit end
     }
 
     protected boolean mustSurvive() {