protected void notifyEntriesRemoved() {
    if (maximumSize > 0) {
      synchronized (waitForEntriesToBeRemoved) {
        waitForEntriesToBeRemoved.notifyAll();
      }
    }
  }
Holds keys for those events that were not found in BucketRegionQueue during processing of
ParallelQueueRemovalMessage. This can occur due to the scenario mentioned in #49196.
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractBucketRegionQueue.java