Incorrect spawn reason for monsters from spawner - Fixes #3708 (#3764)

Spigot-Server-Patches/0344-Entity-getEntitySpawnReason.patch

@@ -58,6 +58,18 @@ index c5abac3eb3f98a948ff7a3423cfcad70abae86ff..4502ea222d98872a4c33714a8c3149c6
              // Paper end
  
          } catch (Throwable throwable) {
+diff --git a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
+index e2f5354709819e56f9bc66b8c8d5e095bc8387b4..df5ac3295ea64fa9bb15f0565610265d55651b87 100644
+--- a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
++++ b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
+@@ -162,6 +162,7 @@ public abstract class MobSpawnerAbstract {
+                             // Spigot End
+                         }
+                         entity.spawnedViaMobSpawner = true; // Paper
++                        entity.spawnReason = org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.SPAWNER; // Paper
+                         // Spigot Start
+                         flag = true; // Paper
+                         if (org.bukkit.craftbukkit.event.CraftEventFactory.callSpawnerSpawnEvent(entity, blockposition).isCancelled()) {
 diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
 index 61d29dabf6ae8be8f8b5b6da9b801e84adda7dfb..6a00d1dcd62034c595723547afb4637e9d7c18a0 100644
 --- a/src/main/java/net/minecraft/server/PlayerList.java