With the initial 13.2.1 withdrawn update my stereo pair were listed as unresponsive in the Home app, although I could still play music and ask it things. I had read about the bricking problem so I just waited, eventually one of the pair updated itself. The other one would not. The only way I found this out was to unpair them and they I could see one was done and the other not. The only way I could fix it was to completely reset the unresponsive one. That was an adventure in itself. I nearly gave up ready to make an appointment at the Apple store. I persevered and eventually it reset and it could be setup again from scratch. Finally I recreated the pair and it all works again.
Talk about stressful!