I just discovered that MakeMKV has an integration option that allows for HD and UHD Blu-Ray disc play in MC. I set it up and it seems to work well with one major problem:
MC crashes and closes when attempting to play streams other than the main film as well as when attempting to enter Blu-Ray menu mode.
Is this a known bug / limitation in MC 27?
I'm running the latest 27.0.85 64 bit build in Win 10 Pro 21H1 OS build 19043.928