Same thing here. Here's what I found. 1) there's and old version of the root hints file. Nov 2017. Current is sept 2020. New one didn't change things. I'll look at my other setup which slaves the root. Caveat: I'm running FreeBSD 12.1 2) Upon executing the dig a second time, it resolves.
Almost looks like some sort of priming issue. YMMV, Bob
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