We are pushing a restriction profile down to our iOS devices running the latest iOS: 15.5. We realized today that even though in that restriction profile we have "Allow USB Restricted Mode" checked (and I can confirm all other restrictions are being pushed successfully from that profile) it is not listed in "General" > "Profiles & Device Management" Configuration Profile > "Restrictions".
That seemss to work as expected.
If "Allow USB Restricted Mode" is not checked, "USB accessories while locked allowed" is listed in the device's "Restrictions" list.(iOS 15.1 in my case)
Yeah I do not see that on my test devices or any other devices.