Fish mobs and dolphins seem to be able to spawn in water blocks way above sea level in their corresponding biomes. I noticed it in a survival world, where a Dolphin dropped onto land from a flooded mob spawning platform in the sky. Also tested in Creative mode above a lukewarm ocean and saw cod, pufferfish and tropical fish spawning.
This seems inconsistent with squid spawning, which is limited to certain Y levels.
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I'm sorry, but how is that bug related to this one? It talks about drowned being able to spawn above the sea floor, not about fish spawning above sea level.
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But that's not the point. MC-135660 "complains" about Drowned spawning at any height in the water, like fish. It does specifically not complain about fish spawning in water bodies way above sea level (Y>64), though.
I agree with you, @unknown; this issue is comparing spawning of fish and dolphins (not limited) with that of squid (limited to 46 to sea level i.e. 64). The other is comparing the spawn conditions of drowned (not limited) with that of zombies (must have block beneath) and mentions that other water mobs also don't have the "must have block beneath" restriction; nothing about sea level. (And, I'd personally say that drowned shouldn't be affected by sea level restrictions, so it's almost the opposite of this issue)
I am going to link them as related simply because they're both spawning issues related to water mobs, but I don't think they're the same bug in any way.
I just loaded the same level I used to test this originally in 1.14.4, and still had fish spawn on that platform.
As far as I can tell this seems to be fixed in 1.18rc3. I assume it was fixed some time during the snapshots when mob spawning was being worked on.
1.18 release notes confirm this as an intentional change ("Cod, Salmon, Pufferfish, Tropical Fish, Squid, and Dolphins now only spawn in water from height 50 to height 64"), so it is indeed fixed.
This change was done in 21w40a as per the changelogs, so I believe this can be marked as Fixed for that version.
Thank you for your report!
However, this issue is a Duplicate of MC-135660.
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