Taking a look at this, most curious:
# mount localhost:/storage /mnt -o vers=3,proto=udp
mount.nfs: an incorrect mount option was specified
root@j-nfs-dep8:~# mount localhost:/storage /mnt -v -o vers=3,proto=udp
mount.nfs: timeout set for Tue Mar 8 14:59:11 2022
mount.nfs: trying text-based options 'vers=3,proto=udp,addr=127.0.0.1'
mount.nfs: prog 100003, trying vers=3, prot=17
mount.nfs: trying 127.0.0.1 prog 100003 vers 3 prot UDP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 127.0.0.1 prog 100005 vers 3 prot UDP port 58825
mount.nfs: mount(2): Invalid argument
mount.nfs: an incorrect mount option was specified
# rpcinfo -p
program vers proto port service
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 44661 status
100024 1 tcp 40383 status
100005 1 udp 45269 mountd
100005 1 tcp 58873 mountd
100005 2 udp 44744 mountd
100005 2 tcp 41675 mountd
100005 3 udp 58825 mountd
100005 3 tcp 60591 mountd
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100227 3 tcp 2049
100003 3 udp 2049 nfs
100227 3 udp 2049
100021 1 udp 33771 nlockmgr
100021 3 udp 33771 nlockmgr
100021 4 udp 33771 nlockmgr
100021 1 tcp 34605 nlockmgr
100021 3 tcp 34605 nlockmgr
100021 4 tcp 34605 nlockmgr
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https://bugs.launchpad.net/bugs/1964093
Title:
nfsver=3,udp not working anymore
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