I know I posted this as a comment is a topic about Meg not linking to Mulan, but I think this bug deserves its own topic.
Meg will link to herself if you use heroes that can fight behind her back, which only include Jafar and Yzma. And since Mulan can no longer link to Meg… Meg is berserk for the whole battlefield.
Here is proof that it isn’t just a visual bug
(Only works with Jafar, Yzma, and Mulan.)