If you invite a friend into the world, and he tames a pet (wolf), and then you send this world to this friend, and he opens the world from himself, then he will not be able to interact with his pet (wolf).
MCPE-184590
When a player opens another player's world, the connection with the previously tamed pet is lost
Resolved
Invalid
0
That is because he opens the world as
~local_player, which is the person who created the world.