SPIGOT-5627: Leads vanish when transporting leashed entities through a Nether portal

nms-patches/net/minecraft/world/entity/EntityInsentient.patch

@@ -285,7 +285,17 @@
              this.dropLeash(true, true);
          }
  
-@@ -1412,7 +1523,14 @@
+@@ -1341,7 +1452,9 @@
+             }
+ 
+             if (this.tickCount > 100) {
++                this.forceDrops = true; // CraftBukkit
+                 this.spawnAtLocation((IMaterial) Items.LEAD);
++                this.forceDrops = false; // CraftBukkit
+                 this.leashInfoTag = null;
+             }
+         }
+@@ -1412,7 +1525,14 @@
          int i = EnchantmentManager.getFireAspect(this);
  
          if (i > 0) {
@@ -301,7 +311,7 @@
          }
  
          boolean flag = entity.hurt(DamageSource.mobAttack(this), f);
-@@ -1480,9 +1598,10 @@
+@@ -1480,9 +1600,10 @@
      @Override
      protected void removeAfterChangingDimensions() {
          super.removeAfterChangingDimensions();