SPIGOT-3696: Clearing custom name of some blocks does not work

src/main/java/org/bukkit/craftbukkit/block/CraftBrewingStand.java

@@ -61,4 +61,13 @@ public class CraftBrewingStand extends CraftContainer<TileEntityBrewingStand> im
     public void setCustomName(String name) {
         this.getSnapshot().setCustomName(name);
     }
+
+    @Override
+    public void applyTo(TileEntityBrewingStand brewingStand) {
+        super.applyTo(brewingStand);
+
+        if (!this.getSnapshot().hasCustomName()) {
+            brewingStand.setCustomName(null);
+        }
+    }
 }

src/main/java/org/bukkit/craftbukkit/block/CraftEnchantingTable.java

@@ -25,4 +25,13 @@ public class CraftEnchantingTable extends CraftBlockEntityState<TileEntityEnchan
     public void setCustomName(String name) {
         this.getSnapshot().setCustomName(name);
     }
+
+    @Override
+    public void applyTo(TileEntityEnchantTable enchantingTable) {
+        super.applyTo(enchantingTable);
+
+        if (!this.getSnapshot().hasCustomName()) {
+            enchantingTable.setCustomName(null);
+        }
+    }
 }

src/main/java/org/bukkit/craftbukkit/block/CraftEndGateway.java

@@ -1,5 +1,6 @@
 package org.bukkit.craftbukkit.block;
 
+import java.util.Objects;
 import net.minecraft.server.BlockPosition;
 import net.minecraft.server.TileEntityEndGateway;
 import org.bukkit.Location;
@@ -27,7 +28,7 @@ public class CraftEndGateway extends CraftBlockEntityState<TileEntityEndGateway>
     public void setExitLocation(Location location) {
         if (location == null) {
             this.getSnapshot().exitPortal = null;
-        } else if (location.getWorld() != (this.isPlaced() ? this.getWorld() : null)) {
+        } else if (!Objects.equals(location.getWorld(), this.isPlaced() ? this.getWorld() : null)) {
             throw new IllegalArgumentException("Cannot set exit location to different world");
         } else {
             this.getSnapshot().exitPortal = new BlockPosition(location.getBlockX(), location.getBlockY(), location.getBlockZ());
@@ -43,4 +44,13 @@ public class CraftEndGateway extends CraftBlockEntityState<TileEntityEndGateway>
     public void setExactTeleport(boolean exact) {
         this.getSnapshot().exactTeleport = exact;
     }
+
+    @Override
+    public void applyTo(TileEntityEndGateway endGateway) {
+        super.applyTo(endGateway);
+
+        if (this.getSnapshot().exitPortal == null) {
+            endGateway.exitPortal = null;
+        }
+    }
 }

src/main/java/org/bukkit/craftbukkit/block/CraftFurnace.java

@@ -61,4 +61,13 @@ public class CraftFurnace extends CraftContainer<TileEntityFurnace> implements F
     public void setCustomName(String name) {
         this.getSnapshot().setCustomName(name);
     }
+
+    @Override
+    public void applyTo(TileEntityFurnace furnace) {
+        super.applyTo(furnace);
+
+        if (!this.getSnapshot().hasCustomName()) {
+            furnace.setCustomName(null);
+        }
+    }
 }

src/main/java/org/bukkit/craftbukkit/block/CraftLootable.java

@@ -25,4 +25,13 @@ public abstract class CraftLootable<T extends TileEntityLootable> extends CraftC
     public void setCustomName(String name) {
         this.getSnapshot().setCustomName(name);
     }
+
+    @Override
+    public void applyTo(T lootable) {
+        super.applyTo(lootable);
+
+        if (!this.getSnapshot().hasCustomName()) {
+            lootable.setCustomName(null);
+        }
+    }
 }