Pizzicato playback doesn't work for arpeggiated chords
S4 - Minor
In a string part e.g. Viola add "pizz." to a note. It will play back pizzicato (though far too quietly). Add "Up arpeggio" to the note and try back again... it will play back arco.
Verified by Marc Sabatella here https://musescore.org/en/node/337886#comment-1171921 where there is also example image and score.