/usr/share/myspell/dicts/ar_TN.aff is in hunspell-ar 3.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/myspell/dicts/../../hunspell/ar.aff
/usr/share/myspell/dicts/../../hunspell/ar.aff