@-symbol not mapped with logical keyboard

[egrath]

Problem:
When using the logical keyboard with a german keyboard layout, the @-symbol is not mapped. Other keys which use Alt-Graph combinations like [,],{,},\ and ~ work like expected.

Desired result:
@-symbol is mapped correctly with german keyboard.

How to reproduce:
Set your keyboard to german layout, run b-em and set the keyboard mapping to logical. Press Alt-Graph+Q to produce the @-symbol. Just a Q is shown.