I have an instanced save from right as I fired a Wounding Shot with Sagani. I created a topic regarding the quicksave issue specifically, but as it seems, it also belongs in this discussion. Wounding Shot was Already Activated forever on Sagani afterwards, even after dismissing/recruiting her several times.
Link to Dropbox file
When scouting with Sagani, ordering her to use Wounding Shot, and then proceeding to a quicksave before the ability landed - or as it was being cast - resulted in Wounding Shot becoming permanently unavailable upon reload of save file. The ability was therefore marked as ¨already being used¨, and could no longer be used in combat.
Link to Dropbox file