HTML Output for "attrs()" in combination with ".withClass()" does not work

[rrarrarra]

Actual behavior (the bug)

<div class="def"></div>

Expected behavior

<div class="abc def"></div>

To Reproduce

import static j2html.TagCreator.*;

import org.junit.Assert;

public class Bug {
	
	public static final void bug() {
		
		final String html = div(attrs(".abc"))
			.withClass("def") //or:  .withClasses("def")
			.withText("")
			.render();
		
		System.out.println(html); // prints:  <div class="def"></div>
		
		Assert.assertEquals("<div class=\"abc def\"></div>", html); // Expected is:  <div class="abc def"></div>
	}
	
}