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@Gordon
I'm afraid it's just a 'features' of iOS. The phone expects that the services advertised by the Thingy haven't changed and it doesn't bother scanning again - and because it's an Apple device, it knows best and doesn't allow NRF connect to ask it to re-scan.
IMO NRF connect on iOS should come with a massive disclaimer about that as it seems to be a common source of pain.
I bet if you tried on an Android phone it'd show the services just fine.
I think if you turned Bluetooth off and back on - and definitely if you restarted the phone - it would show the services too.