The bot died at the lesser demon in Melzar's maze during Dragon Slayer 1. When restarting the quest it tries to enter the maze without the key and gets stuck there.
I reran the script, waited for it to get all the items from the bank, and then paused it. I grabbed the key from the bank and resumed it. That was the way for the bot to enter the maze again.
It also doesn't grab any runes as a mage when entering the maze again.
Edit: grabs no food when re-entering the maze as well.