Calling ListBlobsSegmentedAsync method of Microsoft.Azure.Storage.Blob's (11.1.2) CloudBlobContainer attaches the blob metadata if BlobListingDetails.Metadata parameter (3rd) is set. However if blob metadata's value is empty, the metadata is not returned at all.

In turn, the metadata with empty value is displayed in the Storage Explorer.

BlobResultSegment blobList = await container.ListBlobsSegmentedAsync(blobPath, true, BlobListingDetails.Metadata, null, continuationToken, null, null);
                
foreach (CloudBlockBlob blobItem in blobList.Results)
{
  // trying to access blobItem's metadata
}

Edit: It seems it's not possible to create metadata with empty value through Azure Storage Blob's API (throws ArgumentException). However with Storage Emulator it's possible.

I need to upload blobs containing metadata with empty ("" or null) value, is it possible somehow?

Edit 2: The feature is working with Azure.Storage.Blobs v.12.8.3. I'm using Microsoft.Azure.Storage.Blob v11.1.2. So the question applies to this library!