Games can contain AI-generated content that doesn’t fit into these categories, like puzzle design for example. (Not saying that’s the case here necessarily, just saying that it could/should be (and possibly is?) an option for AI disclosure.)
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That the categories are supposed to be mandatory, makes this look like a bug.
Puzzle design would be code or text or both. Maybe graphics, depending on your puzzles. But it would not be a separate thing that would leave all 4 categories unchecked.
But this is going offtopic. If there is a fifth category, we should discuss this elsewhere.