Agreed! It would be helpful to see the run history logs. Is there an error message? 
There is a weird bug we have to fix where if any AI query blocks have a timeout over two minutes, the workflow fails when you run the whole workflow (despite individual blocks all working). Any chance that's what is causing your workflow to fail?
Once we resolve this, we'd love to hear more about your use case for the AI Query block. If you follow the format outlined here, you'll earn a badge for your community.retool.com profile & could win prizes.