Paper/nms-patches/PathfinderGoalVillagerFarm.patch

--- a/net/minecraft/server/PathfinderGoalVillagerFarm.java
+++ b/net/minecraft/server/PathfinderGoalVillagerFarm.java
@@ -40,7 +40,11 @@
             Block block = iblockdata.getBlock();
 
             if (this.i == 0 && block instanceof BlockCrops && ((BlockCrops) block).w(iblockdata)) {
-                world.setAir(blockposition, true);
+                // CraftBukkit start
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(this.f, blockposition, Blocks.AIR.getBlockData()).isCancelled()) {
+                    world.setAir(blockposition, true);
+                }
+                // CraftBukkit end
             } else if (this.i == 1 && iblockdata.isAir()) {
                 InventorySubcontainer inventorysubcontainer = this.f.dD();
 
@@ -49,19 +53,28 @@
                     boolean flag = false;
 
                     if (!itemstack.isEmpty()) {
+                        // CraftBukkit start
+                        Block planted = null;
                         if (itemstack.getItem() == Items.WHEAT_SEEDS) {
-                            world.setTypeAndData(blockposition, Blocks.WHEAT.getBlockData(), 3);
+                            planted = Blocks.WHEAT;
                             flag = true;
                         } else if (itemstack.getItem() == Items.POTATO) {
-                            world.setTypeAndData(blockposition, Blocks.POTATOES.getBlockData(), 3);
+                            planted = Blocks.POTATOES;
                             flag = true;
                         } else if (itemstack.getItem() == Items.CARROT) {
-                            world.setTypeAndData(blockposition, Blocks.CARROTS.getBlockData(), 3);
+                            planted = Blocks.CARROTS;
                             flag = true;
                         } else if (itemstack.getItem() == Items.BEETROOT_SEEDS) {
-                            world.setTypeAndData(blockposition, Blocks.BEETROOTS.getBlockData(), 3);
+                            planted = Blocks.BEETROOTS;
                             flag = true;
                         }
+
+                        if (planted != null && !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(this.f, blockposition, planted.getBlockData()).isCancelled()) {
+                            world.setTypeAndData(blockposition, planted.getBlockData(), 3);
+                        } else {
+                            flag = false;
+                        }
+                        // CraftBukkit end
                     }
 
                     if (flag) {