The demonstration video where I test the following:

• hoverEvent &
• clickEvent

by using /tellraw on selector:@e

The positioning of the hoverEvent text on certain entity names was completely off from where it actually should be.

On players, for the most part, it works as intended with a minor issue or possibly intended from the size of chat (where on the edge of the screen, it doesn't register).

On entities, however, hoverEvent never works on the first one on the list but clickEvent does. Instead of having the hoverEvent text display right on the name of the entity you're hovering over, it starts from the comma and ends at the entity name and works regardless if you clicked the hovered space between the comma+entity name or the actual entity name.

As an alternative, have it display the hoverEvent text as well as entity information on the hover text box:
<hover text>
<entity name>
type: <type>
uuid: <uuid>