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I have several files with similar problems (error codes). I attempted to follow your suggestion, but the decrypted backup failed. I am pretty stumped as to what to try next.

Did you ever figure out what the source of this problem was? I am getting similar errors while trying to read two brand new (2021/early 2022) BluRays (FWIW Black Widow and Shang-Chi). Debug log started at Wed Jan 12 23:17:32 2022 , written by MakeMKV v1.16.5 darwin(x64-release) 001005:0000 MakeMKV v...