See example seed: -112898373387825308, X=-243, Y=50, Z=387.
I have seen this a couple of times now, thought I wanted to report it as a bug since I could not find similar issues. The stronghold is not generated, but there is pockets of air in the ocean where it should be. See attachment.
Cheers!
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I went in the ground under the air pockets and there was a mineshaft. Come to think of it, the same was the case the other time I saw this. Maybe the generating of Strongholds glitches out because the mineshaft occupies the ground, just guessing lol

Just wanted to add that this is not a duplicate of MC-29503:
Isolated stronghold portal room generated in ocean
IMO 😉

Duplicate of MC-954