> During in-house testing, which involved taking an iPhone 16 from iOS 18.5 to iOS 26.4.1, The Register found that Apple has kept the háček in the Czech keyboard, but removed the ability to use it in a custom alphanumeric passcode. The OS will not allow users to input the háček as a character. The key's animation triggers, as does the keyboard's key-tap sound, but the character is not entered into the string.
Sounds more like an actual bug than a decision to change the keyboard layout, if this happens only in the passcode screen?
Good on El Reg for doing some actual hands on fact finding.
I remember something like 10 years ago there was an article here in HN, where someone created a user on macOS with password out of emojis.
Then he couldn’t login, because login screen does not have a special character keyboard.
EDIT: found it https://news.ycombinator.com/item?id=10742351 (apparently I remember it slightly wrong, but idea still the same)