Comment by weinzierl

"ß as SS that's an error in Unicode"

It's not. Uppercase of ß has always been SS.

Before we had a separate codepoint in Unicode this caused problems with round-tripping between upper and lower case. So Unicode rightfully introduced a separate codepoint specifically for that use case in 2008.

This inspired designers to design a glyph for that codepoint looking similar to ß. Nothing wrong with that.

Some liked the idea and it got some foothold, so in 2017, the Council for German Orthography allowed it as an acceptable variant.

Maybe it will win, maybe not, but for now in standard German the uppercase of ß is still SS and Unicode rightfully reflects that.