"Received a failure event for test with unknown id" when running dynamically created tests

At some point in our set of tests we try to dynamically generate some tests and run them in parallel. The test fails with the following error message:

Received a completed event for test with unknown id '30.936'. Registered test ids: '[root, 30.925, 30.969, 30.2, 30.1]'

While I cannot share that code, it seems to be the exact same issue reported here: http://forums.gradle.org/gradle/topics/received_a_failure_event_for_test_with_unknown_id. This was linked to a gradle issue (GRADLE-2005) which is set to fixed in 1.4. However, I am still able to reproduce it in 1.11 using the example provided by that topic (just wrap a minimal gradle java project around it). Note that I’m currently working on windows, although I doubt that makes a difference in this case.

For reference, the test case that reproduces the problem:

package foo;
  import junit.framework.Test;
  import junit.framework.TestCase;
  import junit.extensions.ActiveTestSuite;
  public class ExampleTest extends TestCase
      public ExampleTest(String testName)
      public void testA() {
      public static Test suite() {
          ActiveTestSuite suite = new ActiveTestSuite();
          for(int i=0; i < 100; i++) {
              suite.addTest(new ExampleTest("testA"));
          return suite;

Since the previous topics are over 2 years old, I decided to create this new topic.