FFMpeg - Video with built-in ass subtitle not working

I have a bunch of videos that has .ass subtitles but they won’t show, pressing L1, it displays a message trying to cycle to other audio streams, R1 not only don’t display a message as won’t show any substitles. Any tips?

Can anyone confirm a working subtitle configuration? Edit: Ok, apparently, there is some working subtitle support. I’ve got an MKV with a working ssa. For some reason, trying to replicate it with a movie and an external subtitle that I muxed myself into an MKV won’t work in RA.