Squids never spawn in superflat worlds, even during chunk generation.
Steps to Reproduce:
[Step 1] Create a new world.
settings: peaceful, creative, superflat
presets: minecraft:bedrock,128*minecraft:water;minecraft:river
[Step 2] Log in.
Observed Results:
No mobs spawning at all.
Expected Results:
Aquatic mobs spawn periodically.
Notes:
Occurred after the Salmon Update.
If you start the same world with 1.21.1, squids will spawn.
Linked issues
Comments 2
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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I can confirm this, but if tested in easy, normal, or hard I can find drowneds spawning.