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Yep, looks like you did everything correctly from what I can see. I just tested it myself and I cannot replicate the behavior you're seeing. This is probably a good case to submit to support (firstname.lastname@example.org).
I am also encountering the same issue with one of my workflow when publishing it to the gallery. But for mine only 2 out of 20+ or so change to "external" after publishing to the gallery. I did the same steps as you when publishing to the gallery.
Did you get any resolution from Alteryx Support on this?