Generative Fill Unable to Use a Selection

Any instruction to copy/duplicate current selection ignores current selection, even when the selection is in its own layer.

Any instruction to copy/duplicate current selection ignores current selection, even when the selection is in its own layer.
I am not asking Generative Fill for an "array", "grid", "table" or anything else that would require rows or columns. GF does recognize:
Sure, I have written a PS Action to approximate this request. However, I would hope that GF can save you and me the labor, in addition to assisting those who are not comfortable with Actions or Scripts. It already can randomize sizes and locations of generated objects when it populates an adjacent empty area.
In a way, GF does "work" in my example — it populated the pitch, albeit with a field of tennis balls from Mars. (Where did those come from?!)
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