The six active Haadhir forms remain on the same Kasrah pattern.
FormPosition
لَا تَفْعِلَنَّsingular masculine Haadhir
لَا تَفْعِلَانِّdual masculine Haadhir
لَا تَفْعِلُنَّplural masculine Haadhir
لَا تَفْعِلِنَّsingular feminine Haadhir
لَا تَفْعِلَانِّdual feminine Haadhir
لَا تَفْعِلْنَانِّplural feminine Haadhir
Check: every active form still keeps Kasrah on the middle root letter.