When typing strings in German, Copilot++ offers appropriate suggestions, but all characters containing an umlaut are systematically omitted/deleted (i.e. some letters are missing in words).
The issue seems to happen only with the fast model.
Example:
Correct: Ich komme zurück.
Copilot++ suggestion (it offers to correct the sentence to): Ich komme zurck.
This issue does not seem to occur with other accentuation characters (e.g é or à in French)