There are currently no known problems that require additional documentation.
After upgrading from macOS 10.12 Sierra or lower, a client might not correctly read files from NFSv4 servers created with previous versions of macOS, OS X, or Mac OS X: If you have used older versions of the operating system to write Macintosh files to an NFSv4 server, and the server implementation supports named attributes, and the files are using Extended Attributes or forks, these attributes and forks will become temporarily inaccessible after upgrading to macOS 11.0 Big Sur.
Workaround: This is a documented policy change in Apple’s NFSv4 client as of macOS 10.13. If you like to continue using named attributes over NFSv4, you will have to enable a new NFSv4 mount option on each client. This option is called Enforce extended attributes and named forks if supported by server in NFS Manager. For Apple’s documentation, enter the command man 5 nfs in Terminal.
If you add automount triggers to the Finder sidebar, the Finder may intermittently remove them: In case your system is configured to use NFS automounts, a user may drag the topmost folder of the automounted file system or an object from that hierarchy into the Favorites section of the sidebar of a Finder window. This way, the automount can be triggered easily, without needing an additional alias object on the Desktop. The Finder might unexpectently lose such sidebar entries, however.
Workaround: This is a known issue of the Finder. We hope that Apple will resolve this problem in future versions of macOS. A possible alternative is to create an alias for the automounted folder (by using either the Finder or the feature Create Desktop icon of NFS Manager) and to drag the alias to the sidebar.
Some applications cannot process files on an NFS server if those files have not been created using the identical file service protocol: If you write a Macintosh file with Extended Attributes or forks to an NFS server using a different protocol (like AFP, or SMB, or a different NFS standard like NFSv3 vs. NFSv4, or by creating this file directly on the server writing it to the local hard disk), you may later have problems opening this file. Each file sharing protocol uses different techniques to handle Extended Attributes. Those techniques are not compatible with each other, so you cannot write a file with attributes using one protocol but read it with another protocol.
Workaround: You should avoid using different file server protocols at the same time when reading and writing Macintosh files with Extended Attributes. Even when you only use NFS, you must take care either not to allow simultaneous access via NFS3 and NFSv4, or to enforce matching options for the use of named attributes on all clients.