On iPhone 17 Pro Max running iOS 27.2 beta (24B5084k), Music.app hangs and is watchdog-terminated when opening the Library tab, but only with Sync Library enabled.
to reproduce: 1. Settings › Apps › Music › Sync Library OFF — app works normally. 2. Enable Sync Library, let it finish syncing. 3. Open Music and navigate to the Library tab.
Result: The app freezes immediately and is terminated. Home, Radio and Search all play normally with Sync Library on — the hang is isolated to the Library tab. The stackshot from Analytics Data shows multiple threads blocked on a single thread, including com.apple.SwiftUI.AsyncRenderer, with the watchdog reporting "Failed to terminate gracefully after 5.0s".
No VPN, no automatic downloads, no local files. The same Apple Music account works normally on iPadOS 26 and on Apple Music for Windows. 100% reproducible.
Filed as FB24865181.
Has anyone else hit this? If so, does your Music- analytics log show the same blocked-thread signature?