Before the version 1.18, the snow golems are need to be in cold enough biomes to create snow trails, After 1.18 version, the snow golems can now create snow trail at any biome such as nether. This change has not been confirmed as intentional by Mojang.
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True. From Minecraft 1.18 onward, snow golems no longer check biome temperature when placing snow.
In 1.17 (Yarn mappings), snow placement required a cold biome:
BlockPos blockPos = new BlockPos(i, j, k);
if (this.world.getBlockState(blockPos).isAir()
&& this.world.getBiome(blockPos).getTemperature(blockPos) < 0.8F
&& blockState.canPlaceAt(this.world, blockPos)) {
this.world.setBlockState(blockPos, blockState);
}In 26.1snapshot1 (unobfuscated), for example, this check was removed:
BlockPos snowPos = new BlockPos(xx, yy, zz);
if (this.level().getBlockState(snowPos).isAir()
&& snow.canSurvive(this.level(), snowPos)) {
this.level().setBlockAndUpdate(snowPos, snow);
this.level().gameEvent(GameEvent.BLOCK_PLACE, snowPos, Context.of(this, snow));
}That's why, snow golems are able to generate snow trails in any biome, including warm biomes and dimensions like the Nether.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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Related to MC-377