Dropped tables used to be handled differently and were no longer tracked once they were dropped. The clearsnapshot command was fixed (CASSANDRA-6418 <https://issues.apache.org/jira/browse/CASSANDRA-6418>) but listsnapshots doesn't appear to be (for whatever reason). It looks like an oversight to me. Would you mind logging a ticket for it -- https://issues.apache.org/jira/secure/CreateIssue.jspa?pid=12310865? Cheers!
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