After replying to an e-mail in the bugs@openbsd.org mailing list regarding the borked bootup, Theo de Raadt replied and confirmed that a snapshot went out without the commit for the ABI break, and it was replaced by a newer snapshot that did have it. He recommended updating using a miniroot snapshot.

Downloaded the latest miniroot78 snapshot from an mirror, brewed some water for my mate as the miniroot78 snapshot image written to a USB drive, and then booted from it on the laptop. Update went through wonderfully and I'm back to a booting OpenBSD system. πŸ§‰ :flan_hacker:​:puffer:​:runbsdBg:​

Picture of my Evoo EVC141-12BK laptop with my mate beverage to the left of it. On the screen of the laptop is the miniroot installer finishing up the install over http, and congratulating me on a successful install.
0

If you have a fediverse account, you can quote this note from your own instance. Search https://bsd.network/users/claudiom/statuses/115549726142579900 on your instance and quote it. (Note that quoting is not supported in Mastodon.)