List method has different behavior on different cloud providers

import org.jclouds.ContextBuilder;
import org.jclouds.blobstore.BlobStore;
import org.jclouds.blobstore.BlobStoreContext;
import org.jclouds.blobstore.domain.Blob;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;

public class ListTest {
	public static void main(String[] args) {
		String containerName = "test.container";
		String dataString = "testData";
		String testDirectory = "testDirectory";
		String blobName = "blob1";
		AWSCredentials creds = new DefaultAWSCredentialsProviderChain().getCredentials();
		//Setup the contexts
		BlobStoreContext transientContext = ContextBuilder.newBuilder("transient")
				.credentials(creds.getAWSAccessKeyId(), creds.getAWSSecretKey())
				.build(BlobStoreContext.class);
		BlobStoreContext awsS3Context = ContextBuilder.newBuilder("aws-s3")
				.credentials(creds.getAWSAccessKeyId(), creds.getAWSSecretKey())
				.build(BlobStoreContext.class);
		//Setup the blobstores
		BlobStore transientStore = transientContext.getBlobStore();
		BlobStore awsStore = awsS3Context.getBlobStore();
		//Setup the container
		transientStore.createContainerInLocation(null, containerName);
		awsStore.createContainerInLocation(null, containerName);
		//Setup the directories
		transientStore.createDirectory(containerName, testDirectory);
		awsStore.createDirectory(containerName, testDirectory);
		//setup the blobs
		Blob transientBlob = transientStore.blobBuilder(testDirectory +"/" + blobName).build();
		Blob awsBlob = awsStore.blobBuilder(testDirectory +"/" + blobName).build();
		//create the payloads
		byte[] transientPayload = dataString.getBytes();
		byte[] awsPayload = dataString.getBytes();
		//set the payloads
		transientBlob.setPayload(transientPayload);
		awsBlob.setPayload(awsPayload);
		//Upload the blobs
		transientStore.putBlob(containerName, transientBlob);
		awsStore.putBlob(containerName, awsBlob);

		System.out.println("Directory size should be the same but is not: transient + " + transientStore.list(containerName).size()
				+ ", aws = " + awsStore.list(containerName).size());
	}
}