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Mac client sends Getport for Mount1 UDP before sending Umount call, since we don't support UDP it fails, and Mac client doesn't retry for TCP and never send Umount call, in case of Linux it retries with TCP if it fails with UDP, that's ideal behaviour. Mac client doesn't support mountproto option, as per RFC we can force NFS client to use TCP for MOUNT protocol using mountproto=tcp. We need to document this behaviour.
When you'd like something to be documented, set the Documentation flag to "DP"->doc pending. Divya then takes charge of bringing in the documentation. You can help her with the tech details. Turn it into a FAQ question. Ask Divya, she knows how to go about it. Also, what you described is the protocol level behaviour. You'll need to document the behaviour seen for the Mac command line and Finder UI.