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.
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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.
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.