Also make field volatile

nms-patches/CommandListenerWrapper.patch

@@ -12,7 +12,7 @@
      private final ResultConsumer<CommandListenerWrapper> l;
      private final ArgumentAnchor.Anchor m;
      private final Vec2F n;
-+    public CommandNode currentCommand; // CraftBukkit
++    public volatile CommandNode currentCommand; // CraftBukkit
  
      public CommandListenerWrapper(ICommandListener icommandlistener, Vec3D vec3d, Vec2F vec2f, WorldServer worldserver, int i, String s, IChatBaseComponent ichatbasecomponent, MinecraftServer minecraftserver, @Nullable Entity entity) {
          this(icommandlistener, vec3d, vec2f, worldserver, i, s, ichatbasecomponent, minecraftserver, entity, false, (commandcontext, flag, j) -> {