I was playing around with a datapack and I found a fully-fledged stronghold above ground.
Strangely, I did /locate stronghold and it said that there weren't any nearby.
I recreated it in 1.16 aswell, but for some reason I can't add 1.16 as a Version in the bug tracker, so bonus bug?
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Can confirm in 20w51a.
Them spawning like this is intentional, see MC-10666 - the bug is that /locate can't locate them.