I had the similar issue. CBPeripheral device stucks in Connecting state. My problem was that I had 2 different CBCentralManager. First central manager just discovers CBPeripheral. Second work as background central manager. So when the first manager discovered peripheral I store this CBPeripheral. Next I tried to connect stored peripheral with second central manager. And connection stucks in connecting state. I fix this issue by removing second central manager and use only the first.

I have the similar issue. I use state restoration. And when trying connect to CBPeripheral my device stuck in Connection state. Has anyone ideas how to solve this issue ?

I update Xcode from 14.2 to 15.2 and problem disappeared.