Unable to select older test case versions while cloning a test case in Zephyr Scale

It's an odd one.  The Help files seem to say that you can't use an older version of a test case to create a new test case (I'm assuming a Clone also applies as a create action).  But why have a dropdown to seemingly select a version if it doesn't do anything.  Perhaps it's a bug.  I'd speak to SmartBear support and see if they can help - would be interested to hear what they say.

Version control help page