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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