Why can't I mount an NFS share on macOS Sequoia 15.5?

On macOS Sequoia 15.5, I am unable to mount a NFS share from a Debian server. And showmount doesn't work, i.e.:

$ showmount -e myServer

showmount: Cannot retrieve info from host: omv: RPC: Program not registered

My /etc/nfs.conf file looks like this:

nfs.client.mount.options = nfssvers=3,async,tcp,rw,rdirplus,rsize=65536,wsize=65536,locallocks

And rpcinfo -p myServer on the mac client looks like this:

program vers proto   port
    100000    4   tcp    111  rpcbind
    100000    3   tcp    111  rpcbind
    100000    2   tcp    111  rpcbind
    100000    4   udp    111  rpcbind
    100000    3   udp    111  rpcbind
    100000    2   udp    111  rpcbind
    100005    3   udp  42419  mountd
    100005    3   tcp  54335  mountd
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100227    3   tcp   2049  nfs_acl
    100003    3   udp   2049  nfs
    100227    3   udp   2049  nfs_acl
    100021    1   udp  51022  nlockmgr
    100021    3   udp  51022  nlockmgr
    100021    4   udp  51022  nlockmgr
    100021    1   tcp  44773  nlockmgr
    100021    3   tcp  44773  nlockmgr
    100021    4   tcp  44773  nlockmgr
    100024    1   udp  42149  status
    100024    1   tcp  43701  status

Also, /etc/exports on the server looks like this:

/export/my-share-2025-01 10.0.1.0/24(fsid=5c62a167-aba5-4115-b68c-e5ed8d459d34,rw,crossmnt,insecure,nroot_squash,async,no_subtree_check,anonuid=502,anongid=20)
/export 10.0.1.0/24(ro,fsid=0,root_squash,subtree_check)

How can I troubleshoot and fix this?