I can not detect any subtitle with this disk once the mkv file is created the report tells me that the traces of forced subtitles are empty and are removed even if I have selected normal subtitles.

To get a confirmation I used Stream Extractor to perform the demux of pgs subtitles, and I checked that they are complete and working.
I did another test by creating the mkv file with other commercial software, the subtitles are present and working.
Maybe this Blu-ray has a particular structure for MakeMKV?
I ask if it is possible to resolve this anomaly for this title.
Thank you