as request, the feedback number is FB21257943. Though sadly, I tried to install the new RC build and it has resulted in my iPhone being officially bricked. The installation ran through, and on reboot got stuck on the Apple logo. I want to avoid a full restore, so I will keep trying the update option. Strangely before the update, it asked me to optimise because it went to create storage – it unloaded a few apps and the system data shut up to 175GB. I can't access the phone at the moment.

thank you, I have raised it under FB21257943. though sadly now the device is officially bricked, as I tried install the latest build hoping for a fix but now its stuck on the apple logo. want to avoid a restore, so will keep trying the rc build update