The wording simply says "a disintegrate spell". It does not say what it has to be cast on or wether it continues to travel towards the real target afterwards. But the implication clearly is that you have to hit the wall. Thus, RAW, even with specific overriding general, you cannot target the wall because it is invisible (nothing in its spell description states otherwise) and you can’t target space behind the wall, as it is behind cover.
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