I can't complete the very first escort mission because enemies deal a lot of damage and when I'm using the last healing kit that they gave me in the inn, I can't quit the pop- up window and It is possible to heal infinitely.
The healing kits being bugged certainly is an issue, but... I'm confused how you are having difficulty with the first mission? It's extremely easy. I've played through probably a hundred times and literally only used a healing kit once, and it definitely wasn't on the first mission. They're simply not needed, which might be why no one else has noticed this bug before... no one uses healing kits.
