@JBrosi just pointed out in [Course Forum] Genki 1 - Deutsch, that in the associated course https://www.memrise.com/course/923889/genki-1-deutsch-mit-audio/ the “Normal keyboard Input” (Romanji) does only work for the main solutions.
E.g.:
Say i have a word
English: four
Solution: し (written “shi”)
Alternatives: よん (written “yon”)
Valid solutions are now: し, よん, shi
But this does not work: yon
Is this a know bug?