Paper PR: Fix async command building throwing CME in some cases

leaf-server/minecraft-patches/features/0296-optimize-tickEffects.patch

@@ -0,0 +1,35 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: hayanesuru <hayanesuru@outlook.jp>
+Date: Sat, 30 Aug 2025 20:30:37 +0900
+Subject: [PATCH] optimize tickEffects
+
+
+diff --git a/net/minecraft/world/entity/LivingEntity.java b/net/minecraft/world/entity/LivingEntity.java
+index efbad651cd6fa1ea73265761f8e91f84c07316d5..dc5cbabe8909cedf79e915a6129bfe414d69d106 100644
+--- a/net/minecraft/world/entity/LivingEntity.java
++++ b/net/minecraft/world/entity/LivingEntity.java
+@@ -951,6 +951,7 @@ public abstract class LivingEntity extends Entity implements Attackable, Waypoin
+ 
+     protected void tickEffects() {
+         if (this.level() instanceof ServerLevel serverLevel) {
++            if (!this.activeEffects.isEmpty()) { // Leaf - optimize tickEffects
+             Iterator<Holder<MobEffect>> iterator = this.activeEffects.keySet().iterator();
+ 
+             this.isTickingEffects = true; // CraftBukkit
+@@ -976,6 +977,8 @@ public abstract class LivingEntity extends Entity implements Attackable, Waypoin
+ 
+             // CraftBukkit start
+             this.isTickingEffects = false;
++            } // Leaf - optimize tickEffects
++            if (!effectsToProcess.isEmpty()) { // Leaf - optimize tickEffects
+             for (ProcessableEffect effect : this.effectsToProcess) {
+                 if (effect.effect != null) {
+                     this.addEffect(effect.effect, effect.cause);
+@@ -984,6 +987,7 @@ public abstract class LivingEntity extends Entity implements Attackable, Waypoin
+                 }
+             }
+             this.effectsToProcess.clear();
++            } // Leaf - optimize tickEffects
+             // CraftBukkit end
+             if (this.effectsDirty) {
+                 this.updateInvisibilityStatus();