I have emailed across the files for the steelbook s2 UHD, which can't proceed due to unknown keys.
As requested in the forum topic head frame/thread, here are the file names:
MKB20_v82_ARCANE_SEASON_2_-_DISC_1_4FC1
MKB20_v82_ARCANE_SEASON_2_-_DISC_2_7E25
MKB20_v82_ARCANE_SEASON_2_-_DISC_3_CE69
I also have the same issue with S1, however the log files aren't downloading, so haven't yet been able to upload them.