PA can't play the files. Before its working. I have no problem if i use the samsung mp3 player. I try a lot, delete datas, install new and so on. What can i do? Samsung Galaxy S22 Ultra
So this does confirm that SAF was in fact working after the update to A13. So you must not have given permission to PA to have access to that Music folder as described previously.
It is great that you now have access to your tunes again using Legacy mode. But this has been suggested as a temporary work around and may not be a permanent solution.