Fix Registry#getKey implementation

test-plugin/src/main/java/io/papermc/testplugin/TestPlugin.java

@@ -1,5 +1,9 @@
 package io.papermc.testplugin;
 
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
+import org.bukkit.Art;
+import org.bukkit.Registry;
 import org.bukkit.event.Listener;
 import org.bukkit.plugin.java.JavaPlugin;
 
@@ -10,6 +14,10 @@ public final class TestPlugin extends JavaPlugin implements Listener {
         this.getServer().getPluginManager().registerEvents(this, this);
 
         // io.papermc.testplugin.brigtests.Registration.registerViaOnEnable(this);
+
+        final Registry<Art> registry = RegistryAccess.registryAccess().getRegistry(RegistryKey.PAINTING_VARIANT);
+        final Art art = registry.get(TestPluginBootstrap.NEW);
+        System.out.println(art.getKey());
     }
 
 }