Same problem here. I got 5 dev devices. All with iOS 18.0.1 dont get their symbols copied (stuck at various percentages, even after hours). iOS 17.x devices work without problems. macOS 15.0.1, Xcode 16.0. A real nasty problem! 15.0.1 didnt do it for me.
Deleting DerivedData or iOS DeviceSupport doesnt help. Other solutions like putting device into flightmode and enforce usb doesnt help either...
b00tsyb00ts
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Turns out it was a problem with the nib file, which was not a problem for the "old way" of registering nibs.
I recreated a new swift class + xib file and then it worked. Couldn't see what the difference was though...