@Override
  public final void preTearDown() throws Exception {
    ConflationDistributedTestHelper.unsetIsSlowStart();
    Invoke.invokeInEveryVM(ConflationDistributedTestHelper.class, "unsetIsSlowStart");
    // close the clients first
    client0.invoke(HAGIIDistributedTest::closeCache);
    // then close the servers
    server0.invoke(HAGIIDistributedTest::closeCache);
    server1.invoke(HAGIIDistributedTest::closeCache);
  }
queue a tombstone GC message for the client. See bug #46832
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ha/HAGIIDistributedTest.java