PaperMC/paper-server/nms-patches/net/minecraft/world/entity/animal/EntitySnowman.patch

--- a/net/minecraft/world/entity/animal/EntitySnowman.java
+++ b/net/minecraft/world/entity/animal/EntitySnowman.java
@@ -40,6 +40,10 @@
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+// CraftBukkit end
+
 public class EntitySnowman extends EntityGolem implements IShearable, IRangedEntity {
 
     private static final DataWatcherObject<Byte> DATA_PUMPKIN_ID = DataWatcher.defineId(EntitySnowman.class, DataWatcherRegistry.BYTE);
@@ -95,7 +99,7 @@
         super.aiStep();
         if (!this.level().isClientSide) {
             if (this.level().getBiome(this.blockPosition()).is(BiomeTags.SNOW_GOLEM_MELTS)) {
-                this.hurt(this.damageSources().onFire(), 1.0F);
+                this.hurt(this.damageSources().melting(), 1.0F); // CraftBukkit - DamageSources.ON_FIRE -> CraftEventFactory.MELTING
             }
 
             if (!this.level().getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING)) {
@@ -111,7 +115,11 @@
                 BlockPosition blockposition = new BlockPosition(j, k, l);
 
                 if (this.level().getBlockState(blockposition).isAir() && iblockdata.canSurvive(this.level(), blockposition)) {
-                    this.level().setBlockAndUpdate(blockposition, iblockdata);
+                    // CraftBukkit start
+                    if (!CraftEventFactory.handleBlockFormEvent(this.level(), blockposition, iblockdata, this)) {
+                        continue;
+                    }
+                    // CraftBukkit end
                     this.level().gameEvent((Holder) GameEvent.BLOCK_PLACE, blockposition, GameEvent.a.of(this, iblockdata));
                 }
             }
@@ -138,6 +146,11 @@
         ItemStack itemstack = entityhuman.getItemInHand(enumhand);
 
         if (itemstack.is(Items.SHEARS) && this.readyForShearing()) {
+            // CraftBukkit start
+            if (!CraftEventFactory.handlePlayerShearEntityEvent(entityhuman, this, itemstack, enumhand)) {
+                return EnumInteractionResult.PASS;
+            }
+            // CraftBukkit end
             this.shear(SoundCategory.PLAYERS);
             this.gameEvent(GameEvent.SHEAR, entityhuman);
             if (!this.level().isClientSide) {
@@ -155,7 +168,9 @@
         this.level().playSound((EntityHuman) null, (Entity) this, SoundEffects.SNOW_GOLEM_SHEAR, soundcategory, 1.0F, 1.0F);
         if (!this.level().isClientSide()) {
             this.setPumpkin(false);
+            this.forceDrops = true; // CraftBukkit
             this.spawnAtLocation(new ItemStack(Items.CARVED_PUMPKIN), this.getEyeHeight());
+            this.forceDrops = false; // CraftBukkit
         }
 
     }