As you said, from the MSDN blog article, ReFS will not support "named streams, object IDs, short names, compression, file level encryption (EFS), user data transactions, sparse, hard-links, extended attributes, and quotas". See:
Building the next generation file system for Windows: ReFS
This article is updated in January. For your current situation, we do not have enough information to make sure it is a change or sparese files could just be created on FeFS but not work correctly. We may need to wait for further information and I will try
to contact related department for your case. Thank you for your time.
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