In early snapshots, they simply extended the build limit upwards like you suggested, so when people loaded their old worlds in they started complaining about kilometer-high walls generating in every direction
That would lead to playering being able to accidentally mine themselves off a cliff and throw themselves into the void. You’re not supposed to get under the bedrock.
I’ve had many hundreds of hours of Minecraft these past few years but… What’s layer 4?
Y-level. Before 1.18 the top layer containing bedrock (ETA: in the overworld) was y=4.
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bedrock now spawns around Y=-60, give or take a few blocks
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Compatibility with existing worlds
In early snapshots, they simply extended the build limit upwards like you suggested, so when people loaded their old worlds in they started complaining about kilometer-high walls generating in every direction
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that would require moving every single thing up which would break a lot of stuff like mod/plugin data
That would lead to playering being able to accidentally mine themselves off a cliff and throw themselves into the void. You’re not supposed to get under the bedrock.
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That would probably cause a lot of lag and bugs
Technically, the top layer bedrock can spawn at is either y=128(the nether roof) or the top of the obsidian towers in the main end island