Locl, idotaccent: switch from script latn to script cyrl?

In Glyphs 2.6.1, updating features causes the locl feature

language TAT;
sub i by idotaccent;

to jump from script latn to cyrl. Is this intentional? Tatar uses Cyrillic, but not latin latters?

Font: https://gitlab.gnome.org/GNOME/cantarell-fonts/tree/master/src

You can write Tatar in Latin as well. First generation of locl usually works fine. Regenerating the language systems may switch the Tatar entry from Latin to Cyrillic.