[Bug] argument parser cannot parse string with ":" about brigadier HOT 6 OPEN

commandDispatcher.register(
	literal("checkit")
	.then(
		argument("server", word())
			.executes(c -> {
				String server = c.getArgument("server", String.class);
				int port = 25565;

				if(server.contains(":")) {
					String[] split = server.split(":");
					server = split[0];
					port = Integer.parseInt(split[1]);
				}

				checkWhitelisted(c.getSource(), server, port, c.getSource().getUsername());
				return 1;
			})
			.then(argument("user", string())
				.executes(c -> {
					String server = c.getArgument("server", String.class);
					int port = 25565;

					if(server.contains(":")) {
						String[] split = server.split(":");
						server = split[0];
						port = Integer.parseInt(split[1]);
					}

					checkWhitelisted(c.getSource(), server, port, c.getArgument("user", String.class));
					return 1;
				})))
);

public class IpArgumentType implements ArgumentType<Ip> {

    @Override
    public <S> Ip parse(StringReader reader) throws CommandSyntaxException {
        String input = reader.getRemaining().split(" ")[0];
        reader.setCursor(reader.getCursor() + input.length());

        return new Ip(input);
    }

    @Override
    public <S> CompletableFuture<Suggestions> listSuggestions(CommandContext<S> context, SuggestionsBuilder builder) {
        return null;
    }

    @Override
    public Collection<String> getExamples() {
        return Arrays.asList("127.0.0.1", "127.0.0.1:25567");
    }
}

public class Ip {

    private String ip;
    private int port = 25565; //default port

    public Ip(String ip) {
        this.ip = ip;

        if(ip.contains(":")) {
            String[] split = ip.split(":");
            this.ip = split[0];
            try {
                port = Integer.parseInt(split[1]);
            }catch (NumberFormatException ex){
                throw new NumberFormatException(String.format("%s is not a number !!", split[1]));
            }
        }
    }

    public Ip(String ip, int port) {
        this.ip = ip;
        this.port = port;
    }

    public String getIp() {
        return ip;
    }

    public int getPort() {
        return port;
    }
}