@Test
  public void destroyOfExistingEntryWithConcurrencyChecksAddsTombstone() throws Exception {
    givenConcurrencyChecks(true);
    givenExistingEntryWithVersionTag();

    doDestroy();

    verifyDestroyReturnedTrue();
    verifyEntryDestroyed(existingRegionEntry, false);
    verifyInvokedDestroyMethodsOnRegion(false);
  }
This might be a bug. It seems like we should have created a tombstone but we have no version
tag so that might be the cause of this bug.
geode-core/src/test/java/org/apache/geode/internal/cache/map/RegionMapDestroyTest.java