My last 2 updates overwrite Grub2 in a Centos 8/OpenBSD setup. The update proceed normally and generates no warnings. I recovered the last time by booting the Centos install disk in rescue mode and running grub-install. With some direction, I should be able to provide install logs on my next OpenBSD-current update. Please provide specifics as to what is needed.
Thanks -- J. Scott Heppler