The script to see who used a health potion doesn't seem to track the 10.2 dreamwalker's healing potion when it's used. I know some of these scripts come from external addons, so I apologize if this is not native to the details addon itself, but I only use the elitism extension. If this is not something you can address on your end, you can disregard.

I can support if the script is called "Health Potion & Stone", see the image below. I will also need a wowhead link of the item.