Question for those with iPhones/iPads using scheduled Night Shift

I think it was iOS (or iPad OS as the iPad version is now called) 14 that introduced -- supposedly -- popup keypad entry for scheduling Night Shift instead of being limited to the virtual scroll wheel. Does anyone else find that it doesn't work? I observe the same behavior as this person on their iPhone - that it cuts off the input and closes the keypad after you've typed one or two digits and it's impossible to type a complete time. The same behavior makes it impossible to correct such an error and I don't seem to be able to target entering the hour or minutes specifically. (Scroll-wheeling works as it always did.) The non-answer from the Apple "specialist" there was irritating.