Alegreya Sans and serif - missing 4 sub Serbian Italic glyphs

Hello, I am graphic designer and I am fond of good fonts. Alegreya Sans and serif are very nice Pro fonts.
We can see that in OT feature locl for Serbian, only one glyph б has sub, other four г,д,п,т Italic glyphs sub is missing, even they exists in the font.
Here is copy/paste example from locl features taken from FontLab OTF :

feature locl { # Localized Forms
script cyrl; # Cyrillic
language SRB exclude_dflt; # Serbian
sub uni0431 by uni0431.loclSRB;
language BSH exclude_dflt; # Bashkir
sub [uni0492 uni0498 uni0493 uni0499] by [uni0492.loclBSH uni0498.loclBSH uni0493.loclBSH uni0499.loclBSH];

Please, tell me how it could be fixed.
Thanks in advance,
Milos