When I was watching a short from moreswamp, second channel of mogswamp, a chat from this stream discover that glow squids no longer spawn in superflat world and only this world type has a bug. So, I created a test world where the layer are Stone, Water, Water and Tinted Glass and no glowsquids spawn even if I move very far away and they still don’t spawn. Moreover the bug has appeared in update 1.21.1 where the baby squid are added. To prove my statement, I made a video in my world.
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The issue I believe is with superflat sea level getting changed to -63 instead of defaulting to 63 starting on 1.21.2
This affected everything based on sea level such as phantom spawning, squid/dolphin/fishes, glow squid, turtle, non-river drowned, ocelots, lower snowfall, drowned/frog behaviours, etc.
re: squid/marine mobs spawning
The requirement was the first 13 y levels on/below sea level (50 to 63 by default) which got shifted to -76 to -63. They require water fluid below, so tests will have to replace any y -64 blocks with water or any waterlogged block that would collide with the mobs and we will be able to get them to spawn at y -63.
The y -64 won’t spawn any because y -65 can’t be water anymore.
re: glow squid
The requirement was below sea level - 33 (y 30 and below by default) which got shifted to y -96 and below, so completely out of build limit.
Likewise, tp-ing players to something like -63.01 will be safe from phantom, but -63 or higher is not, again, having to remove the last y -64 layer.
Thank you for your report!
We're tracking this issue in MC-276319, so this ticket is being resolved and linked as a duplicate.
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not just squid, but all peaceful marine mobs