Multiple home homekit restore

I have two homes in HomeKit, let’s call them “AHome” and “ZHome”. I am the “Resident (Owner)” of both.

My iCloud account is logged in to to two iPhones and an iPad. Previously, both homes were visible on all 3 devices.

Recently I backed up to my MacBook and then reset one of my iPhones and restored it from the backup (to solve a separate issue). After the backup restore, this phone has a brand new empty Home in HomeKit called “My Home” and it has “AHome” and all its devices.

How can I get “ZHome” back on this iPhone?

For what it’s worth, “ZHome” was created first, so “AHome” is both the most recently created home and alphabetically the first home in the backup list. I’m wondering if there’s an iOS18 bug where only one home kit home is restored after a backup. Both “AHome” and “ZHome” are still present and working fine on the other iPhone and the iPad.