/usr/share/myspell/dicts/bg_BG.aff is in myspell-bg 4.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/myspell/dicts/../../hunspell/bg_BG.aff
/usr/share/myspell/dicts/../../hunspell/bg_BG.aff