BlobClient, file intermittently not released with UploadAsync

[dimula]

Which service(blob, file, queue, table) does this issue concern?

Blob

Which version of the SDK was used?

v4.0.30319

Which platform are you using?

.Net 4.8

What problem was encountered?

Exception on File.Delete: System.UnauthorizedAccessException
Message: Access to the path '\RC14DP09\file_name.pdf' is denied.

How can we reproduce the problem in the simplest way?

        var client = containerClient.GetBlobClient(blobName);
        using (var fileStream = File.OpenRead(filePath))
        {
            await client.UploadAsync(fileStream, overwrite);
        }
        File.Delete(filePath);

File exists on network drive.
Happens ocasionally.

Have you found a mitigation/solution?

No

[dimula]

I think it has nothing to do with BlobClient