If the user types অধ্যায়ে, the spell checker suggests অধ্যায়ে, which visually appears identical. However, there is a difference at the Unicode level: the user input consists of two characters (য় = U+09AF + U+09BC), whereas the suggestion uses a single character (য় = U+09DF).
If the intention is to treat the user’s two-character input as correct, it is necessary to add a rule in the affix file as follows:
ICONV 1
ICONV য় য়
