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by notaplumber1 1462 days ago
> While doing this I noticed my old rules referenced lo as the loopback IF, but it's clearly called lo0.

You were using interface groups. The loopback interface, lo0 is a part of the lo interface group.

https://man.openbsd.org/ifconfig#group

When upgrading avoid long jumps, and always read the upgrade guides, they cover important changes between releases.