Enderman are rare now

I been having problems finding the enderman and when I used my looting II sword on them, they don' drop the ender pearl. I should get at least one drop from them. They are getting harder to found in the world. Unless it is because of the experiment gameplay. So I just want to know if it' a bug that no enderman spawn in the version. As well, didn' see the enderman in the nether like in the console version.