It seems that the issue is still around or a new one creeped in? I can see a number of crashes in Crashlytics on iOS 15.5.0. Crashed: com.apple.network.connections 0 libquic.dylib 0x6b06c qlog_abort_internal + 276 1 libquic.dylib 0x6b058 qlog_abort_internal + 256 2 libquic.dylib 0x239e4 quic_send_frames_for_key_state + 3928 3 libquic.dylib 0x301e0 quic_migration_probe_path + 1532 4 libquic.dylib 0x33010 quic_migration_new_cid + 156 5 libquic.dylib 0x110e0 quic_frame_process_NEW_CONNECTION_ID + 4080 6 libquic.dylib 0x647cc quic_frame_process + 140 7 libquic.dylib 0x169c4 quic_process_inbound + 1376 8 libnetwork.dylib 0x5dd5f0 nw_protocol_data_access_buffer + 1064 9 libquic.dylib 0x157cc __quic_handle_inbound_block_invoke + 152 10 libquic.dylib 0x10bc quic_handle_inbound + 124 11 libnetwork.dylib 0x5c048c __nw_protocol_implementation_get_input_internal_block_invoke + 136 12 libnetwork.dylib 0x5bf60c nw_protocol_implementation_get_input_internal + 252 13 libnetwork.dylib 0x5be7f8 nw_protocol_implementation_read + 436 14 libnetwork.dylib 0x5bdf08 nw_protocol_implementation_input_available + 96 15 libnetwork.dylib 0x514698 nw_channel_add_input_frames + 9236 16 libnetwork.dylib 0x512198 nw_channel_update_input_source + 328 17 libnetwork.dylib 0x5113a4 __nw_channel_create_block_invoke.29 + 72 18 libdispatch.dylib 0x3a30 _dispatch_client_callout + 20 19 libdispatch.dylib 0x6eec _dispatch_continuation_pop + 500 20 libdispatch.dylib 0x1a13c _dispatch_source_invoke + 1596 21 libdispatch.dylib 0xcf80 _dispatch_workloop_invoke + 1784 22 libdispatch.dylib 0x16500 _dispatch_workloop_worker_thread + 648 23 libsystem_pthread.dylib 0x10bc _pthread_wqthread + 288 24 libsystem_pthread.dylib 0xe5c start_wqthread + 8

I started to experience slow incremental builds after setting the defaults write com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration 1. Once I set it back to 0, restarted Xcode and removed derived data all is looking good. Will take a closer look later what is the actual issue when it's set to 1.

You would need something like these functions when the app is backgrounded and then foregrounded:     func enterIntoBackground() {         if #available(iOS 14, *) {             if self.player?.rate == 1 {                 DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) { [weak self] in                     if self?.player?.rate == 0 {                         self?.playerViewController?.player = nil                         self?.player?.play()                     }                 }             }         } else {             self.playerViewController?.player = nil         }     }     func enterIntoForeground() {         if #available(iOS 14, *) {             // When the phone was locked in full screen mode             guard let vc = self.playerViewController else { return }             if vc.player == nil {                 vc.player = self.player             }         } else {             self.playerViewController?.player = self.player         }     }