I actually have a working theory after looking at the logs. @kitaT I need you to be very precise on the answer to this question. Did you read the disc with MakeMKV before generating either of these logs _without ejecting it after reading with MakeMKV_?
Yes. I was running Makemkv before logging with AnyDVD.
OPD became "BD_035ab2606cf9" when I took a log after executing Makemkv again in 8.4.8.3.
When Create Logfile with AnyDVD, avoid after running Makemkv.
Thanks SamuriHL.