When a renamed "Minecart with Chest" or "Minecart with Hopper" is dispensed, the name of the minecart is not displayed in the top left corner, but instead is replaced by the default text of "Minecart" or "Item Hopper".

Easy way to reproduce:
1. Rename a minecart with chest or minecart with hopper
2. Put it in a dispenser pointing at a rail
3. Activate the dispenser
4. Open the minecart's UI and look at the name of the container
5. It is not what you renamed the minecart to

**Just for clarification, when you manually place a renamed minecart, it keeps it's name in the container name slot.**

*If this is a duplicate I am sorry. I did a search and didn't find anything.*