Entities being renamed revert to their old name

Publish_503712

Summary:
If, for example an armor stand is named something, and I try to rename it, it reverts back to its old name on world reload. The same occurs to other entities.
Impact:
Makes it difficult to have named entities especially if they are specially formatted and you want to rename them. They would require being created from scratch again.
Repro Steps:
1. summon an entity for example an armor stand
2. get a nametag from inventory and name it something in an anvil
3. name the entity
4. name the nametag something else in the anvil
5. name the entity the something else
6. reload the world.
Observed results:
The entity will retain the first thing it was named
Expected results:
it should have the new name.
Screenshots/videos attached:
https://www.youtube.com/watch?v=wODgSOoUdkM