When typing the native command /recipe and then <space> I am given a list of acceptable options "give" and "take".

I want to provide tab completion like this.

I implemented TabCompleter correctly but the onTabComplete() method is only ever called when I begin typing the argument after a space. It does not get called after the initial <space> and therefore does not provide a list of acceptable arguments until you start pressing random keys after the space.

I get the correct list of options when pressing tab at the console but as a player in Minecraft tab will only complete my player name until I begin typing.

My tab completion object is simple. It prints a message to the console every time it is triggered and always returns a list of two options:

public class OnTabComplete implements TabCompleter {
   @Override
   public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
      System.out.println(command.getName());
   
      return Arrays.asList(new String[] { "apple", "pear" });
   }
}

The issue is that it never gets called when I type the command and <space>. It only gets called after I begin typing the first argument.