Just as in me just finding as opposed to the post being recent, I think it was from 2021, and the problem statement is very similar to mine. And I didn't immediately think it would be a PEBCAK since I made no changes to my router or the Caddy config as of late, so that's why the post. But ya in this case, it was somehow routed to an internal gateway even though an external resolver was set, and I didn't use any PBRs on the router side of things to route DNS queries.
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