- an AACS issue (the movie is from 2022 though and I couldn't find other postings about the movie),
- an MakeMKV license key issue (which may or may not have expired two days ago depending on the difference between "evaluation expires" and "version expires"),
- an issue with the disk (although I made sure it was pristine - no prints, smudges, scratches, or dust), or
- an issue with my drive (Archgon MD-8107S-U3YC-UHD).
For whatever it's worth, I've attached the AACS dump file. I'd appreciate any suggestions people might have. Thanks.