Iron golems do not follow the doMobSpawning gamerule

The bug

In my world, doMobSpawning is false, and iron golems still spawn in the village I made. But everything else does not spawn.

Code analysis / fix

Based off of Minecraft 1.11, MCP 9.35

net.minecraft.village.Village.java

public void tick(int tickCounterIn)
    {
        //added "&& this.worldObj.getGameRules().getBoolean("doMobSpawning")"
        if (this.numIronGolems < i && this.villageDoorInfoList.size() > 20 && this.worldObj.rand.nextInt(7000) ==  0 && this.worldObj.getGameRules().getBoolean("doMobSpawning"))
        {
        	//...