Michael Heerdegen <michael_heerdegen@web.de> writes:

> I think this has been fixed - see Bug#11309, and especially this commit:
>
> beebd2a85e Recognise ß properly as a lower-case letter (bug#11309)
> Mattias Engdegård <mattiase@acm.org> Wed Dec 9 13:27:16 2020 +0100

Paul, any chance you can try again with a newer Emacs?

TIA,

Michael.