Endermite nametagging

I am trying to make an enderman so farm. After this recent update when I spawn an endermite and put it in a minecraft, it does not let me name tag the endermite, so it will de spawn. I try to do it with multiple ways but it still doesn't work. When I put the name tag on the endermite first, then put it in the minecart, the name tag disappears, and the endermite quickly depawns. Is this a new feature in the update or is it a bug. Also I am playing this on a server.