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Hello all,structures started appearing in my world that shouldn't be there!Just look through the photos.I created a world in creative mode for building. I used the mods: Essential mod, Smooth GUI, Moderner beta. (old generation).I created a regular world without using a template for classic generation.

I cannot find any bug reports of this behavior occurring in vanilla, so it is most likely caused by one (or more) of the mods you are using. If you did not change any structure-related settings at all, then it is either an intentional feature of said mod(s) or a mod-induced bug.

Well, look, the Essential mod is created for a more modern integration with other players. Smooth GUI - for interface animations, as I said earlier, I did not use the classic generation template in "moderner beta". None of these mods do this, and I repeat that I did not use the classic generation template.

Quote from GodMineYT123»

Well, look, the Essential mod is created for a more modern integration with other players. Smooth GUI - for interface animations, as I said earlier, I did not use the classic generation template in "moderner beta". None of these mods do this, and I repeat that I did not use the classic generation template.

Easiest way to confirm is to remove all mods and test the world (or new worlds) in vanilla.

If structures still generate "where they shouldn't be," then mods aren't the problem. Otherwise they are.

This shouldn't be possible at all in vanilla (though I don't know how they might have recoded things since 1.12.2); each dimension has its own list of structures that can generate in that dimension, and nothing else (even if you made the game generate the Nether or End in the Overworld their structures wouldn't generate because structures aren't tied to the biome, yes, many do generate in specific biomes but a dimension-specific structure generator checks if the biome is suitable at a chosen location, and this makes it all the more improbable as not only are structures generating in the wrong dimension but the wrong biome, so it has to be some issue with a mod even if you don't think it is):

public class ChunkGeneratorOverworld implements IChunkGenerator
{
    public void populate(int x, int z)
    {
        this.mineshaftGenerator.generateStructure(this.world, this.rand, chunkpos);
        this.villageGenerator.generateStructure(this.world, this.rand, chunkpos);
        this.strongholdGenerator.generateStructure(this.world, this.rand, chunkpos);
        this.scatteredFeatureGenerator.generateStructure(this.world, this.rand, chunkpos);
        this.oceanMonumentGenerator.generateStructure(this.world, this.rand, chunkpos);
        this.woodlandMansionGenerator.generateStructure(this.world, this.rand, chunkpos);

public class ChunkGeneratorHell implements IChunkGenerator
{
    public void populate(int x, int z)
    {
        this.genNetherBridge.generateStructure(this.world, this.rand, chunkpos);

public class ChunkGeneratorEnd implements IChunkGenerator
{
    public void populate(int x, int z)
    {
        this.endCityGen.generateStructure(this.world, this.rand, new ChunkPos(x, z));

As opposed to how e.g. desert wells generate (the biome itself generates them, so if you modded the game to add deserts to the Nether they would have desert wells, as well as cacti, dead bushes, etc, although the generation of surface blocks is controlled by the dimensional generator so they won't have sand):

public class BiomeDesert extends Biome
{
    public void decorate(World worldIn, Random rand, BlockPos pos)
    {
        super.decorate(worldIn, rand, pos);

        if (rand.nextInt(1000) == 0)
        {
            int i = rand.nextInt(16) + 8;
            int j = rand.nextInt(16) + 8;
            BlockPos blockpos = worldIn.getHeight(pos.add(i, 0, j)).up();
            (new WorldGenDesertWells()).generate(worldIn, rand, blockpos);
        }

he probably just placed it

Occam's Razor