Avatar Navi subtitles
Firstly, a big thanks to all who are helping to update the spreadsheet regarding forced subtitles. I'm finding this resource a great help.
Regarding Avatar Navi subtitles, I have the same problem with MakeMKV (some SDH subtitles being picked up). I may have found an easier way to get these correctly. Note that I am using the Limited Edition 3D version purchased in Thailand.
Firstly, I ripped using DVDFab 188.8.131.52 (may work with older versions). This correctly provides only Navi subtitles when selecting forced only on 1st EN subtitle track (no SDH).
However, because I also need a second subtitle track, I have to select full and forced, resulting in 4 subtitle tracks in the resulting file. I then use mkvmerge to remove the unwanted subtitle tracks.
I am currently going through my collection and can provide additional information on other titles if this will help.