void postDestroyRegion(boolean destroyDiskRegion, RegionEventImpl event) {
    if (diskRegion != null) {
      if (destroyDiskRegion) {
        diskRegion.endDestroy(this);
      } else {
        diskRegion.close(this);
      }
    }
    if (versionVector != null) {
      try {
        cache.getDistributionManager().removeMembershipListener(versionVector);
      } catch (CancelException ignore) {
        // ignore: cache close will remove the membership listener
      }
    }
  }
This method is invoked after isDestroyed has been set to true
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java