I have a partial fix. I updated to the latest version of MakeMKV and tried again. This time it saw all four audio streams. It took a long while during “analyzing seamless segments”, then made the mkvs.
It made two files with prefix A1 (both of the menus), then files with prefixes B1, B3, B5 and B7, each containing one of the four audio streams. Never saw that nomenclature before.
They don’t play in vlcplayer, but do play in an oppo, though weirdly. Like atrocity said, there are no chapter marks. Also no time displays at all, and the video is stuck at what appears to be the last track for each audio stream.
There’s no way to fast forward or skip tracks, but at least it does play through the oppo. Better than nothing, but it does seem like MakeMKV could use an update. Is there any other software that makes mkv files from a disk? Can DVD Decrypter make mkv files? Thanks.
Also, the “backup” option is still greyed out in the latest version.