Newer #OpenBSD/luna88k snapshot based on Jul-7 tree is available!
https://cdn.openbsd.org/pub/OpenBSD/snapshots/luna88k/
As a workaround to prevent SEGV of ssh{,d} with mlkem768x25519-sha256 key exchange algorithm on luna88k, I recommend adding
--
KexAlgorithms -mlkem768x25519-sha256
--
to your /etc/ssh/ssh{,d}_config, see ssh_config(5) and sshd_config(5).