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The original was posted on /r/movies by /u/rick7475 on 2023-08-28 17:43:49+00:00.
So an IP with established canon through a series of books and /or previous movies where someone new took over. Then promised fans that they would be very happy with their new update but instead went totally against the canon, did their own thing, and now the IP is pretty much ruined. Not just an incompetent poorly done execution of the source, but changed things so drastically that it did not really follow the canon, or the way the characters were developed, or the reason for things such as magic systems, character back stories, and other stuff that change things so much that it ruins the IP.
The example I can think of is the Aliens IP. Alien and Aliens were brilliant. But Aliens 3 totally changed things, killing off characters and the whole theme of the first 2 movies.