Kanji characters not being translated, but Hiragana characters are translated

kana.IsKanji("&#28187;&#23569;") recognises that it has Kanji characters but KanaToRomaji does not translate to Romaji it just leaves it as Kanji, Go Playground link below:

https://play.golang.org/p/qxeMAYoSqtk

So I can translate Hiragana characters but not Kanji characters, is that by design?