I also had issues, using wifi on iOS 14 actually broke the network. All other devices connected to the same router (either via wifi or ethernet) started experiencing the same issues.
let myName
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Managed to make wifi work correctly by disabling the automatic DNS on my router and assigning it manually on all devices. This workaround seemed to be working on iPadOS, I still have to test it on macOS Big Sur as it had the same issue.
This is because iOS 17 beta 6 contains a different version of the SwiftData framework in Xcode 15 beta 6. I think we need Xcode beta 7 for it to work.