java - Why does every texture drawn cause a new draw call?

I'm currently working on a 2d sandbox tile game in LibGDX and I noticed I had 700+ draw calls. So checked my code and I could not find anything that would cause a new draw call. All the tiles are drawn between a single batch.begin() and a batch.end(). I commented out the code for rendering the tiles and I had around 2-3 draw calls. I can't figure out whats wrong so I am posting this here.

Here is the call chain of the render method:

In my world class:

public void render(SpriteBatch batch, ShapeRenderer shapeBatch) {

    batch.begin();
    chunkManager.render(batch);
    if (selectedBlock != null) batch.draw(gameScreen.app.assetManager.get("misc/block_selection_texture.png",Texture.class), selectedPosition.x * 32, selectedPosition.y * 32);
    batch.end();


}

World is calling chunkManager.render(..):

public void render(SpriteBatch batch) {
    //Render all the chunks
    for (Chunk c : activeChunks) {
        if (c != currentChunk) {
            c.render(batch);
        }

    }

    //Render Current Chunk the player is in in front of every other chunk
    currentChunk.render(batch);
}

ChunkManager is calling c.render(..):

public void render(SpriteBatch batch){
    //Render all Blocks inside the Chunk
    for(Block b:blocks.values()){

        b.render(batch); // <- this is the line I commented out
    }

    //Render all Entities inside the Chunk
    for(Entity e:entities){
        e.render(batch);
    }
}

Chunk is calling b.render(..):

public void render(SpriteBatch batch){

    float hp = hardness/maxHardness;

    //tint the blocks based on their health
    batch.setColor(1*hp,1*hp,1*hp,1);
    batch.draw(texture, x*32, y*32);
    batch.setColor(Color.WHITE);

}

and e.render(..):

public void render(SpriteBatch batch){
   if(isAnimated) {
       renderAnimation(batch); // -> just batch.draw(..) for animations
   } else {
       batch.draw(texture, x, y);
   }
}