Actually, it’s still generating a random image, but here’s the issue: after the first click on the Service button, it picks and remembers one option from this set:
{{Walking|Sitting} in {Forest|Cave|Fantasy City}}
For example, it might pick Sitting in Forest.
Now, when I click the Regenerate button, it only generates the image using that remembered option (Sitting in Forest).
When I click the Service button a second time, it picks a new option from the set — for example, Walking in Cave — and now Regenerate generates images based on this new choice.
What I would like is for the options from {{Walking|Sitting} in {Forest|Cave|Fantasy City}} to be chosen not only when clicking the Service button, but also every time I click the Regenerate button, so that each regeneration can randomly pick a new variant.