@After
  public void tearDown() {
    invokeInEveryVM(() -> {
      PoolImpl.AFTER_PRIMARY_IDENTIFICATION_FROM_BACKUP_CALLBACK_FLAG = false;
      ClientServerObserverHolder.clearInstance();
    });
  }
Region destroy message from server to client results in client calling unregister to server (an
unnecessary callback). The unregister encounters an error because the region has been destroyed
on the server and hence falsely marks the server dead.

<p>
TRAC #36457: Region Destroy results in unregister interest propagation to server resulting in
server being falsely marked dead
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/ClientDestroyRegionUnregisterInterestRegressionTest.java