Azure.Storage.Blobs.BlobServiceClient CopyFromUri() doesn't seem to be finished copying before returning latest ETag - azure

Question

I am trying to use StartCopyFromUri or StartCopyFromUriAsync to copy a blob from one storage account to another. Even though status.HasCompleted when I try to get the ETag either through
1. var etag = await _siteStorageClient.GetBlobETag(containerPath, asset.BlobName);
//this is the response from WaitForCompletionAsync
2. var etag = complete.GetRawResponse().Headers.Where(x => x.Name == "ETag").FirstOrDefault().Value;
I've tried both methods and both return an Etag that doesn't match what is shown in the properties of the blob when I log in through Azure Portal. It is almost as if the file wasn't done copying(or race condition) when the Etag check was executed. I couldn't find any usage samples on github for the SDK.
Any ideas what could be going awry?
This a similar question but using the older SDK. How to copy a blob from one container to another container using Azure Blob storage SDK
//Storage class
public async Task<CopyFromUriOperation> CopyFile(string containerName, string blobName, Uri sourceUri)
{
var container = _blobServiceClient.GetBlobContainerClient(containerName);
var blockBlobClient = container.GetBlockBlobClient(blobName);
//Made this the synchronous version try and block
//this is the target client
var status = await blockBlobClient.StartCopyFromUriAsync(sourceUri);
while(!status.HasCompleted)
{
//Per Documentation this calls UpdateStatusAsync() periodically
//until status.HasCompleted is true
await status.WaitForCompletionAsync();
}
return status;
}
//Calling Code
var status = await _siteStorageClient.CopyFile(container,BlobName, sasUri);
var etag = await _siteStorageClient.GetBlobETag(container, BlobName);

Answer 1

I was able to get this working after a few tries and troubleshooting. It would only happen in the Azure environment and not when running the web app locally.
Initially the status.WaitForCompletionAsync() was inside the loop and I started getting a socket error. I believe it was getting called too many times and was causing port exhaustion(just speculation at this point).
But this is what is working now.
public async Task<CopyFromUriOperation> CopyFile(string containerName, string blobName,Uri sourceUri)
{
var container = _blobServiceClient.GetBlobContainerClient(containerName);
var blockBlobClient = container.GetBlockBlobClient(blobName);
var status = await blockBlobClient.StartCopyFromUriAsync(sourceUri);
await status.WaitForCompletionAsync();
while(status.HasCompleted == false)
{
await Task.Delay(100);
}
return status;
}