The Following config file causes a Segmentation Fault.
server:
interface: ::1i

Other invalid IP addresses including IPv4 also cause Segmentation Fault. Just add a character after the address
This behavior seems perfectly reproducible.

unbound -d -c ub2.conf

[1681863179] unbound[73354:0] error: node ::1i:53 getaddrinfo: name or service is not known
Segmentation fault

On OpenBSD with unbound installed from the standard package..

unbound -V

Version 1.16.3

Configure line: --enable-allsymbols --with-ssl=/usr --with-libevent=/usr --with-libexpat=/usr --without-pythonmodule --with-chroot-dir=/var/unbound --with-pidfile= --with-rootkey-file=/var/unbound/db/root.key --with-conf-file=/var/unbound/etc/unbound.conf --with-username=_unbound --disable-shared --disable-explicit-port-randomisation --without-pthreads
Linked libs: pluggable-libevent 1.4.15-stable (it uses kqueue), LibreSSL 3.6.0
Linked modules: dns64 respip validator iterator