I took a closer look at the scratch today and found that it's actually a cluster of small abrasions. I must have hit it against the sink while doing dishes or something. Even then, I'm surprised that it sustained that much damage.
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Have some scratches on my slate now. Probably from the Milanese loop. Very disappointing that it’s this new and has scratches. Now they’re not very noticeable in real life, but still, should be harder to do this.