Player spawns suffocating in block - Custom Dimension

When I teleport to my custom dimension, the player always spawns suffocating in a block. My dimension is based off of the nether but in the nether code, it never checks to stop the player suffocating. Any idea how to make the player always spawn with air?

public class WorldProviderMining extends WorldProvider
{
	@Override
	protected void init() 
	{
		this.biomeProvider = new BiomeProviderSingle(BiomeInit.COPPER);
	}
	 
	public IChunkGenerator createChunkGenerator()
	{
		return new MiningChunkGenerator(this.world, true, this.world.getSeed());
	}
	
	@SideOnly(Side.CLIENT)
	public Vec3d getFogColor(float p_76562_1_, float p_76562_2_)
	{
		return new Vec3d(0D,0D,0D);
	}
	
	@Override
	public boolean isSurfaceWorld()
	{
		return false;
	}
	
	@Override
	public boolean canRespawnHere() 
	{
		return false;
	}
	
	@Override
	public boolean canCoordinateBeSpawn(int x, int z) 
	{
		return false;
	}
	
	@Override
	public boolean doesXZShowFog(int x, int z)
	{
		return false;
	}
	
	@Override
	public DimensionType getDimensionType() 
	{
		return DimensionType.getById(Reference.mining_dim_id);
	}
	
	public boolean hasSkyLight() 
	{
		return true;
	}
	
	 @Override
	    public WorldBorder createWorldBorder() 
	    {
	    	return new WorldBorder()
	        {
	            public double getCenterX()
	            {
	                return super.getCenterX() / 8.0D;
	            }
	            public double getCenterZ()
	            {
	                return super.getCenterZ() / 8.0D;
	            }
	        };
	    }
}