Home app on iPhone shows HomePod accessory as "No Response", can't change settings
The 'Home' app on both my iPhone and iPad show the HomePod accessory with "No Response" under the icon. You can tap 'Details' and see settings but can't change anything.
The HomePod responds to "Hey Siri" and plays music fine, and I can Air Play to it from my phone and other devices, control volume and switch songs using the Music app, etc.
But the 'Home' app doesn't work (is read-only) from any device.
I reset and repaired the HomePod and the behavior persists.
(iOS 11.2.5 and HomePod version 11.2.5 (15D59)).
null-OTHER, iOS 11.2.5, HomePod