WaterGenie3
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I don’t understand how this is a duplicate of MC-274088.
Redstone components, including observers, and random ticks (as of 1.21.5) continue to work as expected in spawn chunks after moving the player away/to a different dimension and continue to do so after the player ticket has expired.
However, it is the pistons that fail to extend or retract inside spawn chunks under the same conditions after the player ticket has expired.
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.