This happens a lot when learning a foreign language: You learn some grammar structure, and insert some nouns, verbs, adjectives, etc., in the appropriate places, only to find out that no-one would ever say what you've come up with.
It's not wrong, it's just unused, and as a result sounds unnatural and weird.
Question: Is there a linguistics term meaning "it's grammatically correct, but nobody says that"?
I find myself saying this phrase a lot, and I feel like there should be a technical term with this meaning.
As a concrete example, there's an escalator sticker in China which says:
We've already stepped on this area.
It turns out such stickers were added after an accident, and these stickers are everywhere now, aiming to reassure customers that it is safe to walk there. I believe the above sentence is grammatically correct, and even means exactly what they intended---they have indeed already stepped on that area. But realistically, a native-English speaker would probably write something like:
This area is safe to walk on.