PaperMC/paper-server/patches/sources/net/minecraft/world/item/BoatItem.java.patch

--- a/net/minecraft/world/item/BoatItem.java
+++ b/net/minecraft/world/item/BoatItem.java
@@ -30,7 +_,7 @@
     @Override
     public InteractionResult use(Level level, Player player, InteractionHand hand) {
         ItemStack itemInHand = player.getItemInHand(hand);
-        HitResult playerPovHitResult = getPlayerPOVHitResult(level, player, ClipContext.Fluid.ANY);
+        net.minecraft.world.phys.BlockHitResult playerPovHitResult = getPlayerPOVHitResult(level, player, ClipContext.Fluid.ANY); // Paper
         if (playerPovHitResult.getType() == HitResult.Type.MISS) {
             return InteractionResult.PASS;
         } else {
@@ -51,6 +_,13 @@
             }
 
             if (playerPovHitResult.getType() == HitResult.Type.BLOCK) {
+                // CraftBukkit start - Boat placement
+                org.bukkit.event.player.PlayerInteractEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(player, org.bukkit.event.block.Action.RIGHT_CLICK_BLOCK, playerPovHitResult.getBlockPos(), playerPovHitResult.getDirection(), itemInHand, false, hand, playerPovHitResult.getLocation());
+
+                if (event.isCancelled()) {
+                    return InteractionResult.PASS;
+                }
+                // CraftBukkit end
                 AbstractBoat boat = this.getBoat(level, playerPovHitResult, itemInHand, player);
                 if (boat == null) {
                     return InteractionResult.FAIL;
@@ -60,7 +_,15 @@
                         return InteractionResult.FAIL;
                     } else {
                         if (!level.isClientSide) {
-                            level.addFreshEntity(boat);
+                            // CraftBukkit start
+                            if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPlaceEvent(level, playerPovHitResult.getBlockPos(), player.getDirection(), player, boat, hand).isCancelled()) {
+                                return InteractionResult.FAIL;
+                            }
+
+                            if (!level.addFreshEntity(boat)) {
+                                return InteractionResult.PASS;
+                            }
+                            // CraftBukkit end
                             level.gameEvent(player, GameEvent.ENTITY_PLACE, playerPovHitResult.getLocation());
                             itemInHand.consume(1, player);
                         }