If an entity is tamed, its owner's UUID is sent to all clients tracking it. This can cause several issues. First, the entity inherits the nametag modifications from the owner's team, like its prefix, suffix, and color. This can look weird on a cat's nametag for instance. Second, it can just give extra info that clients do not need to have.

Requires ProtocolLib. Can be downloaded here (You must download the dev build for 1.19 support).

There is a permission to bypass the block on receiving the entity's owner's UUID: hide-entity-owners.bypass.