Same issue, to fix follow this steps:
Windows -> Devices and Simulators
Select your Device from left panel
Uncheck "Connect via network"
Now you need to connect your device via Lightning cable until Apple fix the issue.
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Solution:
System Preferences - General - Prefer tabs: never
I've the same issue. macOS 11.4 + Safari 14.1.1
Same issue since Feb 1st, 2024 too, but now I'm getting the errors again since Feb 5th. Check if your issue was resolved too.