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It will try to find the project file, but if you've given a full stack name it should try to run even if it can't find the yaml file.

I've tried exactly that, assuming the same logic and it wasn't the case

Feel free to raise an issue if you've got a reliable way to repro this. It should work, and we should have tests covering this so I suspect you've hit some odd corner case if it isn't working for you.