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Not a single idiot. That is by design for whatever reason.
Send an e-mail to Thor asking them for the waste diagrams for your unit and you'll discover that is on the prints.
Our bathroom sink is also plumbed to the black tank (and when looking at the diagram you can see that it took a lot more effort to do so than it would have been to route it to the grey tank).
I've heard various reasons as to why they do this but none of them seem that satisfactory...
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