Home app unreliable across network with iOS 18 beta and Sequoia beta

I have installed iOS 18 beta on one iPhone and Sequoia beta on one computer. Other phones and computers are running iOS 17 and Sonoma. Siri now frequently responds with "I'm having trouble... " or "Some accessories are not responding . ". I have the Home app's Home page open on my Mac. It alternates between two versions of my HomeKit setup. In one version I have several scenes (Good Morning, Goodnight, Go to work) configured and it shows correctly that some lights are on. In the other version there are no scenes and everything thing is reported as "No Response". The display switches between versions very few minutes. It seems to me that Home is referencing two versions of truth in my network. I have tried turning off the two devices running beta OSs

Home app unreliable across network with iOS 18 beta and Sequoia beta
 
 
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