Yeah, that is already fixed in the 6.1: they now ship it with the cable with the corner on the other side.
And they also sell that other cable on the store: https://ncases.com/products/m1_power_cable
But out of stock, unfortunately.
Personally, I will get that one from taobao :
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Was not aware there is a v6.1 already! For now I'll just live with it, but good to see it's already fixed. Not sure how I feel about spending a 15$ + shipping for a cable. Is this limited to users with a Corsair PSU, or this issues happened for all PSU's on the v6?