From what I saw in the main post, it sounds like there may be more than one key so I hope this is helpful for others
When opening disc,
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MakeMKV v1.16.4 win(x64-release) started
Using LibreDrive mode (v06.2 id=7FA2657C7667)
Using direct disc access mode
Loaded content hash table, will verify integrity of M2TS files.
Saved AACS dump file as E:/MakeMKV_output/MKB20_v76_The_Green_Knight_3E76.tgz
The volume key is unknown for this disc - video can't be decrypted
Failed to open disc