Java Edition 1.18 experimental snapshot 2

1.18 Experimental Snapshot 2 is the secound experimental snapshot for Java Edition 1.18, released on July 20, 2021, which makes a lot of changes to world generation and mobs spawning.

Blocks

 * Spawners
 * Zombie, Skeleton, Spider, and Cave-Spider spawners now spawn mobs up to block-light level 11. Although the mobs spawning in complete darkness did not affect the difficulty of vanilla spawners, we recognized that these spawners haven't been a real challenge for a while now. We hope this change will make conquering a spawner a more exciting/fun challenge!
 * Spawners have a new tag, which lets you override the spawn rules of the spawned mob. In the tag you can specify "BlockLightLimit" which indicates the highest block-light the spawners will spawn mobs at. This change is to enable map-makers to use spawners in a more customizable manner to spawn mobs in any light levels they choose!

World generation

 * Biomes
 * Biome placement is a bit smoother and less noisy. Fewer microbiomes dotting the terrain. Biomes tend to be a bit larger and less fragmented.
 * Underground biomes interfere less with surface biomes. They can still leak out of cave entrances sometimes though (because it looks kinda cool!)
 * Monsters now spawn in the new mountain biomes
 * Old mountains biomes has been renamed to Extreme Hills
 * This change has been made to reduce the risk of people getting confused when use the command, to find the new mountains and end up in the old mountains.
 * Beachs now are generally wider. But also in some places there are no beaches at all, to provide some variation.
 * Swamps now generate properly. They generated in weird places before
 * Ice spikes and eroded badlands now generate naturally again.


 * Caves
 * Made cheese caves a little bit smaller on average (they can still be huge though!), and a bit less likely to intersect the surface
 * Toned down the megacave entrances a little bit, and made them less likely to go all the way down to deepslate level. Getting to diamond zone was just a bit too easy.


 * Clouds
 * Raised cloud level from 128 to 192


 * Mountains
 * Sheeps now spawn in meadows
 * Rabbits now spawn more often in meadows.
 * Donkeys now spawn less often in meadows.
 * Lone trees now spawn sometimes in meadows, often with a bee nest.
 * Blue orchids no longer spawns in meadows.
 * Increased the height of some of the peaks. Now they can reach up to 220-260 or so, but rarely.


 * Ore veins
 * Made ore veins slightly larger and more frequent, since very few people seemed to actually find them in survival.


 * Structures
 * Structures now show up in the right biomes.


 * General
 * Slightly increased the chance of finding large areas with flat terrain
 * Reduced the chance of sand and gravel being placed in such a way that they immediately fall down on generation. Replaced with sandstone or stone in those cases. The falling blocks were messing up the terrain as well as performance. Still happens but not as often.

Issues

 * This version is not supported on the bug tracker, and therefore issues affecting it will be resolved as "Invalid".