Description of feat: "You gain specialization (see page 243) in all weapons with which you are proficient that can be selected with Weapon Specialization."
When a character multi classes or otherwise gains a weapon proficiency not in their list of class proficiencies they should be getting the damage bonus once they gain the Versatile Specialization feat. However this is not showing up in the character sheet. Only the original class proficiencies are getting the bonus to damage.
I cannot find the location where the data is lost. Data file (scr_feats.lst) looks correct.