This has been asked before in `alphanumeric` style: How to get disambiguation letters (e.g., [ASS96a] and [ASS96b]) in bibliography labels? and there is an open issue about it here.
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This has been asked before in `alphanumeric` style: How to get disambiguation letters (e.g., [ASS96a] and [ASS96b]) in bibliography labels? and there is an open issue about it here.