I tried differents ways of adding new songs to my playlist, but impossible to have more than 16384 songs, and i have more than 30000 in my collection.
BTW could it be possible to just play all the collection (bibliotheque in french) without any playlist?
I finally found out that this limitation is in mpd.conf, i changed it to the required value and it works now, so this was not a bug in fact.
Can't find how to close this ticket, sorry!