I wonder why not setting a locale weekdaySymbols and standaloneWeekdaySymbols display short symbols. This looks like a bug to me. Setting the locale to "en_US" solved the issue. Thanks OOper

"e" is already assigned for the main menu Edit > Find > Use Selection for Find ⌘E. You can't assign an already existing keyEquivalent letter. You need to choose another letter or change the already existent one.

Yes that's why I mentioned "regardless of the value used". It crashes with any value. The generic initializer doesn't work at all. The solution proposed would require me to create multiples methods for all kind of integers and that's not an option.

Looks like that was fixed !!! Works now with Xcode 16.3 !!!