[Hated Tropes] when the sequel ruins the perfectly earned happy ending for no reason

Star wars Sequels. Needs no further introduction.

Boruto. Not completely up to date but i did hear alot how it ruins the Naruto aftermath with naturo dying and kurama too and time travel or some BS

Madoka Rebellion. Now this one is Split in the fanbase as some prefer the ending and theres a sequel to it that will conclude it but for many it felt unecessary to change the very conclusive ending of the anime