What character did Disney lose the rights to?

Good afternoon, I was just wondering if you could clarify something for me. I recently heard a rumor that Disney had somehow lost the rights to a beloved character. Now, I'm a huge fan of Disney and their extensive collection of characters, so this news came as quite a shock to me. Could you please shed some light on the situation? Which specific character did Disney lose the rights to? I'm genuinely curious to know, and I'm sure many other Disney fans are as well. Thank you for your time.