PaperMC/paper-server/nms-patches/net/minecraft/world/entity/npc/MobSpawnerTrader.patch

--- a/net/minecraft/world/entity/npc/MobSpawnerTrader.java
+++ b/net/minecraft/world/entity/npc/MobSpawnerTrader.java
@@ -110,7 +110,7 @@
                     return false;
                 }
 
-                EntityVillagerTrader entityvillagertrader = (EntityVillagerTrader) EntityTypes.WANDERING_TRADER.spawn(worldserver, blockposition2, EnumMobSpawn.EVENT);
+                EntityVillagerTrader entityvillagertrader = (EntityVillagerTrader) EntityTypes.WANDERING_TRADER.spawn(worldserver, blockposition2, EnumMobSpawn.EVENT, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NATURAL); // CraftBukkit
 
                 if (entityvillagertrader != null) {
                     for (int i = 0; i < 2; ++i) {
@@ -118,7 +118,7 @@
                     }
 
                     this.serverLevelData.setWanderingTraderId(entityvillagertrader.getUUID());
-                    entityvillagertrader.setDespawnDelay(48000);
+                    // entityvillagertrader.setDespawnDelay(48000); // CraftBukkit - moved to EntityVillagerTrader constructor. This lets the value be modified by plugins on CreatureSpawnEvent
                     entityvillagertrader.setWanderTarget(blockposition1);
                     entityvillagertrader.restrictTo(blockposition1, 16);
                     return true;
@@ -133,7 +133,7 @@
         BlockPosition blockposition = this.findSpawnPositionNear(worldserver, entityvillagertrader.blockPosition(), i);
 
         if (blockposition != null) {
-            EntityLlamaTrader entityllamatrader = (EntityLlamaTrader) EntityTypes.TRADER_LLAMA.spawn(worldserver, blockposition, EnumMobSpawn.EVENT);
+            EntityLlamaTrader entityllamatrader = (EntityLlamaTrader) EntityTypes.TRADER_LLAMA.spawn(worldserver, blockposition, EnumMobSpawn.EVENT, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NATURAL); // CraftBukkit
 
             if (entityllamatrader != null) {
                 entityllamatrader.setLeashedTo(entityvillagertrader, true);